diff --git a/fastNLP/core/callbacks/__init__.py b/fastNLP/core/callbacks/__init__.py
index f45cf5e0..a47ab998 100644
--- a/fastNLP/core/callbacks/__init__.py
+++ b/fastNLP/core/callbacks/__init__.py
@@ -4,7 +4,8 @@ __all__ = [
     'EventsList',
     'Filter',
     'CallbackManager',
-    'CheckpointCallback',
+    'ModelCheckpointCallback',
+    'TrainerCheckpointCallback',
     'choose_progress_callback',
     'ProgressCallback',
     'RichCallback',
@@ -16,7 +17,7 @@ __all__ = [
 from .callback import Callback
 from .callback_events import EventsList, Events, Filter
 from .callback_manager import CallbackManager
-from .checkpoint_callback import CheckpointCallback
+from .checkpoint_callback import ModelCheckpointCallback, TrainerCheckpointCallback
 from .progress_callback import choose_progress_callback, ProgressCallback, RichCallback
 from .lr_scheduler_callback import LRSchedCallback
 from .load_best_model_callback import LoadBestModelCallback
diff --git a/fastNLP/core/callbacks/callback_manager.py b/fastNLP/core/callbacks/callback_manager.py
index c239f8b1..8b53c70b 100644
--- a/fastNLP/core/callbacks/callback_manager.py
+++ b/fastNLP/core/callbacks/callback_manager.py
@@ -8,7 +8,7 @@ __all__ = [
 
 from .callback_events import Events
 from .callback import Callback
-from .checkpoint_callback import CheckpointCallback
+from .checkpoint_callback import TrainerCheckpointCallback
 from .progress_callback import ProgressCallback, choose_progress_callback
 from fastNLP.core.log import logger
 
@@ -98,7 +98,7 @@ class CallbackManager:
         :return:
         """
         for each_callback in self.class_callbacks:
-            if isinstance(each_callback, CheckpointCallback) and each_callback.is_trainer_checkpoint:
+            if isinstance(each_callback, TrainerCheckpointCallback):
                 self._has_trainer_checkpoint = True
             self.dissect_one_callback(each_callback)
 
@@ -210,7 +210,7 @@ class CallbackManager:
                 each_callback.on_load_checkpoint(trainer, None)
 
     @property
-    def has_trainer_chechpoint(self) -> bool:
+    def has_trainer_checkpoint(self) -> bool:
         return self._has_trainer_checkpoint
 
     @_transfer
diff --git a/fastNLP/core/callbacks/checkpoint_callback.py b/fastNLP/core/callbacks/checkpoint_callback.py
index 5fcc7e26..d3a3b52d 100644
--- a/fastNLP/core/callbacks/checkpoint_callback.py
+++ b/fastNLP/core/callbacks/checkpoint_callback.py
@@ -1,12 +1,13 @@
+__all__ = [
+    'ModelCheckpointCallback',
+    'TrainerCheckpointCallback'
+]
 import os
-from typing import Union, Optional, Callable, Dict, Sequence
+from typing import Union, Optional, Callable, Dict, Sequence, Any, Mapping
 from pathlib import Path
-from functools import partial
-from time import sleep
+from abc import ABC
+import sys
 
-__all__ = [
-    'CheckpointCallback'
-]
 
 import fastNLP
 from .callback import Callback, Filter
@@ -14,35 +15,37 @@ from fastNLP.core.callbacks.utils import _get_monitor_value
 from fastNLP.core.log import logger
 from fastNLP.envs import FASTNLP_LAUNCH_TIME
 from fastNLP.core.utils import synchronize_safe_rm, synchronize_mkdir
+from fastNLP.core.utils import apply_to_collection
 
 
-class CheckpointCallback(Callback):
+class CanItemDataType(ABC):
     """
-    1. 因为只有 'Trainer' 才有 callback，因此评测 metric 实际上就是 validate 时干的事情；
-    2. 默认 'save_last' 为 True，即 model_checkpoint 的默认逻辑是在每一个 epoch 下保存最后的一个模型，模型名字为 last.pth.tar；
-    3. 理论上一个 model_checkpoint 的实例只会负责一个 monitor 的监视，如果用户在训练过程中指定了多个 monitor 的监视，例如 "acc1",
-    "acc2", ... 那么我们会为用户创建多个 model_checkpoint 的实例；
-    4. 理论上，在实际保存的过程中，topk 模式和 固定频率保存的模式是完全独立的，我们确实应当采取一些措施至少保证两者的名字不一样；
+    检测可以进行传输的对象。
+
     """
 
+    @classmethod
+    def __subclasshook__(cls, subclass: Any) -> Union[bool, Any]:
+        if cls is CanItemDataType:
+            item = getattr(subclass, 'item', None)
+            return callable(item)
+        return NotImplemented
+
+
+
+class CheckpointCallback(Callback):
     def __init__(
             self,
             monitor,
-            is_trainer_checkpoint: Optional[bool] = False,
-
             save_folder: Optional[Union[str, Path]] = None,
-
             save_every_n_epochs: Optional[int] = None,
-            save_every_n_global_batches: Optional[int] = None,
+            save_every_n_batches: Optional[int] = None,
             save_last: bool = True,
             save_topk: Optional[int] = None,
             save_on_exception: Optional[Union[BaseException, Sequence[BaseException]]] = None,
-
             larger_better: bool = True,
             only_state_dict: bool = True,
-
             model_save_fn: Optional[Callable] = None,
-
             **kwargs,
     ):
         if monitor is None and save_topk is not None:
@@ -51,9 +54,6 @@ class CheckpointCallback(Callback):
         if monitor is not None and not isinstance(monitor, str):
             raise ValueError("Parameter `monitor` should be of 'str' type.")
 
-        if not isinstance(is_trainer_checkpoint, bool):
-            raise TypeError("Parameter 'is_trainer_checkpoint' can only be `bool` type.")
-
         if save_folder is None:
             logger.warning(
                 "Parameter `path` is None, and we will use the current work directory to find and load your model.")
@@ -67,15 +67,15 @@ class CheckpointCallback(Callback):
             if not isinstance(save_every_n_epochs, int) or save_every_n_epochs < 1:
                 raise ValueError("parameter save_after_epoch_num should be an int and greater than or equal to 1.")
 
-            # 突然发现有一个骚操作在于 'Filter' 内部记载的状态值例如 'num_called' 是这个类全局的，而每次调用 __call__ 中输入的
-            # 函数却是及时传入的，也就是说，我们可以保证 'Filter' 的正常控制频率的逻辑，然后每一次运行的函数都不一样；
-            self._filter_every_n_epochs = Filter(every=save_every_n_epochs)
+        else:
+            save_every_n_epochs = sys.maxsize  # 使得没有数字可以整除
 
-        if save_every_n_global_batches is not None:
-            if not isinstance(save_every_n_global_batches, int) or save_every_n_global_batches < 1:
+        if save_every_n_batches is not None:
+            if not isinstance(save_every_n_batches, int) or save_every_n_batches < 1:
                 raise ValueError(
-                    "parameter save_every_n_global_batches should be an int and greater than or equal to 1.")
-            self._filter_every_n_global_batches = Filter(every=save_every_n_global_batches)
+                    "parameter save_every_n_batches should be an int and greater than or equal to 1.")
+        else:
+            save_every_n_batches = sys.maxsize  # 使得没有数字可以整除
 
         if save_topk is not None:
             if not isinstance(save_topk, int) or save_topk < 1:
@@ -89,12 +89,12 @@ class CheckpointCallback(Callback):
                 if not issubclass(exception, BaseException):
                     raise TypeError("Each exception in parameter `save_on_exception` can only be "
                                     "`BaseException` type.")
-
+        else:
+            save_on_exception = []
         self.monitor = monitor
-        self.is_trainer_checkpoint = is_trainer_checkpoint
         self.save_folder = Path(save_folder)
         self.save_every_n_epochs = save_every_n_epochs
-        self.save_every_n_global_batches = save_every_n_global_batches
+        self.save_every_n_batches = save_every_n_batches
         self.save_last = save_last
         self.save_topk = save_topk
         self.larger_better = larger_better
@@ -107,7 +107,7 @@ class CheckpointCallback(Callback):
         self._topk_model = {}
         self._topn = 0  # 表示目前已经保存了几个最好的模型；
 
-        # 因为我们在 `_get_validate_metric` 函数中，当在返回的 `validate_res` 字典中找不到 `monitor` 时，是使用模糊匹配找到的第一个
+        # 因为我们在 `_get_validate_metric` 函数中，当在返回的 `validate_res` 字典中找不到 `monitor` 时，是使用匹配找到的
         #  key 对应的 value 当做结果；但是这样存在的一个问题在于如果用户传入的 metric 返回的 sub_metric 的名字可能会混淆，并且其在下一次
         #  训练的代码中修改了这些 sub_metric 返回的顺序，那么就会导致模糊匹配拿到的 key 和 value 与之前的不是同一个，这显然不是合理的行为；
         # 因此我们通过该变量来表示我们通过模糊匹配拿到的 key；
@@ -115,76 +115,83 @@ class CheckpointCallback(Callback):
 
         # 注意这里应当保证只有进程 0 在执行这个操作，因为当用户使用 python -m torch.distributed.launch 来拉起进程的时候，
         #  FASTNLP_LAUNCH_TIME 在每一个进程上的值是不一样的；
-        self.log_filepath = self.save_folder.joinpath(os.environ[FASTNLP_LAUNCH_TIME])
+        self.timestamp_path = self.save_folder.joinpath(os.environ[FASTNLP_LAUNCH_TIME])
         # 我们只需要保证这个创建文件夹的操作只在进程 0 上进行即可；因为后续的实际的保存操作，其它进程实际并不会去执行；
-        synchronize_mkdir(self.log_filepath)
+        synchronize_mkdir(self.timestamp_path)
 
     def on_validate_end(self, trainer, validate_res):
         self._save_topk(trainer, validate_res)
 
     def on_train_epoch_end(self, trainer: "fastNLP.Trainer"):
-        self._save_every_n_epochs(trainer)
-        self._save_last(trainer)
+        if trainer.cur_epoch_idx % self.save_every_n_epochs == 0:
+            folder_name = f'{self.folder_prefix}-epoch_{trainer.cur_epoch_idx}'
+            self.save(trainer, folder_name=folder_name)
+        if self.save_last:
+            folder_name = f'{self.folder_prefix}-last'
+            self.save(trainer, folder_name=folder_name)
 
     def on_train_batch_end(self, trainer):
-        self._save_every_n_global_batches(trainer)
+        if trainer.global_forward_batches % self.save_every_n_batches == 0:
+            folder_name = f'{self.folder_prefix}-epoch_{trainer.cur_epoch_idx}-batch_{trainer.global_forward_batches}'
+            self.save(trainer, folder_name=folder_name)
 
     def on_exception(self, trainer, exception: BaseException):
-        if self.save_on_exception is not None and exception.__class__ in self.save_on_exception:
-            folder = self._get_checkpoint_real_save_folder(trainer=trainer, topk=False, metric=None)
-            folder = folder + f"_{exception.__class__.__name__}"
-            self._save_fn(trainer=trainer, topk=False, metric=None, substitute_folder=folder)
+        if exception.__class__ in self.save_on_exception:
+            folder_name = f'{self.folder_prefix}-epoch_{trainer.cur_epoch_idx}-batch_{trainer.global_forward_batches}-' \
+                     f'exception_{exception.__class__.__name__}'
+            self.save(trainer=trainer, folder_name=folder_name)
 
     def on_sanity_check_end(self, trainer, sanity_check_res):
+        # 主要核对一下 monitor 是否存在。
         self._get_validate_metric(sanity_check_res)
 
     def on_save_checkpoint(self, trainer) -> Dict:
         """
-        我们需要保存 CheckpointCallback 内部的几个 filter 的状态；
+        保存 timestamp_path 使得之后可以继续训练并保存到该文件夹。
+        topk_model的状态
+        _real_monitor的值
         """
+
         states = {}
-        if self.save_every_n_epochs is not None:
-            states["_filter_every_n_epochs"] = self._filter_every_n_epochs.state_dict()
-        if self.save_every_n_global_batches is not None:
-            states["_filter_every_n_global_batches"] = self._filter_every_n_global_batches.state_dict()
-        states["real_monitor"] = self._real_monitor
+        states['timestamp_path'] = str(self.timestamp_path.absolute())
+        states['_topk_model'] = apply_to_collection(self._topk_model, dtype=CanItemDataType,
+                                                    function=lambda x:x.item())
+        states['save_topk'] = 0 if self.save_topk is None else self.save_topk
+        states['_real_monitor'] = self._real_monitor
         return states
 
     def on_load_checkpoint(self, trainer, states: Optional[Dict]):
-        if self.save_every_n_epochs is not None:
-            self._filter_every_n_epochs.load_state_dict(states["_filter_every_n_epochs"])
-        if self.save_every_n_global_batches is not None:
-            self._filter_every_n_global_batches.load_state_dict(states["_filter_every_n_global_batches"])
+        timestamp_path = states['timestamp_path']
+        if not os.path.exists(timestamp_path):
+            logger.info(f"The resuming save folder {timestamp_path} is not exists, will checkpoint save to "
+                        f" {self.timestamp_path.absolute()}.")
+        else:
+            logger.info(f"Resume to save in path: {timestamp_path}.")
+            self.timestamp_path = Path(timestamp_path)
+            _topk_model = states['_topk_model']
+            save_topk = None if int(states['save_topk']) == 0 else int(states['save_topk'])
+            if save_topk is not None and self.save_topk is not None:
+                assert self.save_topk == save_topk, f"The checkpoint set save_topk={save_topk}, while this callback set it " \
+                                                    f"as {save_topk}."
+            self._topk_model.update(self._topk_model)
         self._real_monitor = states["real_monitor"]
 
-    def _save_every_n_epochs(self, trainer: "fastNLP.Trainer"):
-        if self.save_every_n_epochs is not None:
-            if self.is_trainer_checkpoint:
-                _fn_every_n_epochs = trainer.save
-            else:
-                _fn_every_n_epochs = trainer.save_model
-            _fn_every_n_epochs = partial(self._save_fn, trainer, False, None, _fn_every_n_epochs, None)
-            _fn_every_n_epochs = self._filter_every_n_epochs(_fn_every_n_epochs)
-            _fn_every_n_epochs()
-
-    def _save_every_n_global_batches(self, trainer: "fastNLP.Trainer"):
-        if self.save_every_n_global_batches is not None:
-            if self.is_trainer_checkpoint:
-                _fn_every_n_global_batches = trainer.save
-            else:
-                _fn_every_n_global_batches = trainer.save_model
-            _fn_every_n_global_batches = partial(self._save_fn, trainer, False, None, _fn_every_n_global_batches, None)
-            _fn_every_n_global_batches = self._filter_every_n_global_batches(_fn_every_n_global_batches)
-            _fn_every_n_global_batches()
-
     def _save_topk(self, trainer: "fastNLP.Trainer", validate_res: Dict):
+        """
+        根据validate_res决定保存哪些model的函数。会自动移除掉不满足topk的文件夹。
+
+        :param trainer:
+        :param validate_res:
+        :return:
+        """
         if self.save_topk is not None:
             _metric_value = self._get_validate_metric(validate_res)
-            _saved_name = self._get_checkpoint_real_save_folder(trainer=trainer, topk=True, metric=_metric_value)
+            folder_name = f"{self.folder_prefix}-epoch_{trainer.cur_epoch_idx}-batch_{trainer.global_forward_batches}" \
+                         f"-{self._real_monitor}_{_metric_value}"
 
             _should_save = False
             if self._topn < self.save_topk:
-                self._topk_model[_saved_name] = _metric_value
+                self._topk_model[folder_name] = _metric_value
                 self._topn += 1
                 _should_save = True
             else:
@@ -192,39 +199,27 @@ class CheckpointCallback(Callback):
                                                                              key=lambda x: self._topk_model[x])
                 if (self.larger_better and _metric_value > self._topk_model[_least_valuable_model]) or \
                         (self.larger_better is False and _metric_value < self._topk_model[_least_valuable_model]):
-                    self._topk_model[_saved_name] = _metric_value
+                    self._topk_model[folder_name] = _metric_value
                     _should_save = True
                     self._topk_model.pop(_least_valuable_model)
-                    synchronize_safe_rm(self.log_filepath.joinpath(_least_valuable_model))
+                    synchronize_safe_rm(self.timestamp_path.joinpath(_least_valuable_model))
 
                 assert len(self._topk_model) == self.save_topk == self._topn
 
             if _should_save:
-                self._save_fn(trainer=trainer, topk=True, metric=_metric_value, substitute_folder=_saved_name)
+                self.save(trainer, folder_name=folder_name)
 
-    def _save_last(self, trainer: "fastNLP.Trainer"):
-        if self.save_last:
-            self._save_fn(trainer=trainer, topk=False, metric=None, substitute_folder="last")
-
-    def _save_fn(self, trainer, topk: bool = False, metric: Optional[Union[int, float]] = None,
-                 substitute_fn: Optional[Callable] = None, substitute_folder: Optional[str] = None):
-        # 首先根据当前的 epoch 和 batch 在 parent_path/FASTNLP_LAUNCH_TIME 下创建子文件夹 epoch-batch-monitor 或者
-        #  epoch-batch-monitor-monitor_value；
-        if substitute_folder is None:
-            folder = self.log_filepath.joinpath(self._get_checkpoint_real_save_folder(trainer, topk, metric))
-        else:
-            folder = self.log_filepath.joinpath(substitute_folder)
+    def save(self, trainer, folder_name):
+        """
+        执行保存的函数，将数据保存在 save_folder/timestamp/folder_name 下。
 
+        :param trainer:
+        :param folder_name:
+        :return:
+        """
+        folder = self.timestamp_path.joinpath(folder_name)
         synchronize_mkdir(folder)
-
-        # 然后再调用 trainer 的 save_model（用于保存模型）或者 save（用于断点重训）函数；
-        if substitute_fn is not None:
-            _fn = substitute_fn
-        else:
-            if self.is_trainer_checkpoint:
-                _fn = trainer.save
-            else:
-                _fn = trainer.save_model
+        _fn = getattr(trainer, self.save_fn_name)
         _fn(
             folder=folder,
             only_state_dict=self.only_state_dict,
@@ -243,18 +238,95 @@ class CheckpointCallback(Callback):
         self._real_monitor = use_monitor
         return value
 
-    def _get_checkpoint_real_save_folder(self, trainer: "fastNLP.Trainer", topk: bool = False,
-                                         metric: Optional[Union[int, float]] = None) -> str:
+    @property
+    def folder_prefix(self):
+        raise NotImplementedError("The `folder_prefix` is not specified")
+
+    @property
+    def save_fn_name(self):
+        raise NotImplementedError("The `save_fn_name` is not specified.")
+
+
+class ModelCheckpointCallback(CheckpointCallback):
+    """
+    保存模型 checkpoint 的  callback ，其保存的文件目录以及文件名命名规则如下
+
+    - save_folder/
+        - YYYY-mm-dd-HH_MM_SS_fffff/  # 自动根据当前脚本的启动时间创建的
+            - model-epoch_{epoch_idx}/  # 满足 save_every_n_epochs 条件保存的模型
+            - model-epoch_{epoch_idx}-batch_{global_batch_idx}/  # 满足 save_every_n_batches 保存的模型
+            - model-last/  # 最后一个 epoch 的保存
+            - model-epoch_{epoch_idx}-batch_{global_batch_idx}-exception_{exception_type}/  # exception时保存。
+            - model-epoch_{epoch_idx}-batch_{global_batch_idx}-{monitor}_{monitor_value}/  # 满足topk条件存储文件名
+
+    model_save_fn 为 None ，则以上每个 folder 中，将生成 fastnlp_model.pkl.tar 文件。
+    若 model_save_fn 不为 None，则 fastNLP 将 folder 绝对路径传递给该函数，fastNLP 不在该 folder 下创建任何文件。
+
+    :param monitor: 监控的 metric 的名称。如果在 evaluation 结果中没有找到完全一致的名称，将使用 最短公共字符串算法 找到最匹配
+        的那个作为 monitor 。
+    :param save_folder: 保存的文件夹，fastNLP 将在该文件下以时间戳创建子文件夹，并在里面保存。因此不同次运行可以将被保存到不同的
+        时间戳文件夹中。如果为 None ，默认使用当前文件夹。
+    :param save_every_n_epochs: 多少个 epoch 保存一次。
+    :param save_every_n_batches: 多少个 batch 保存一次。
+    :param save_last: 如果为 True ，将在每次 epoch 运行结束都保存一次，会覆盖之前的保存。
+    :param save_topk: 保存 monitor 结果 topK 个。
+    :param save_on_exception: 在出异常信息时，是否保存。传入需要捕获的异常的类。
+    :param larger_better: monitor 的值是否时越大越好。
+    :param only_state_dict: 保存模型时是否只保存 state_dict 。当 model_save_fn 不为 None 时，该参数无效。
+    :param model_save_fn: 个性化的保存函数，当触发保存操作时，就调用这个函数，这个函数应当接受一个文件夹作为参数，不返回任何东西。
+        如果传入了 model_save_fn 函数，fastNLP 将不再进行模型相关的保存。在多卡场景下，我们只在 rank 0 上会运行该函数。
+    :param kwargs:
+    """
+    @property
+    def save_fn_name(self):
+        return 'save_model'
+
+    @property
+    def callback_name(self):
         """
-        获取当前保存模型的真正地名字；
-        metric 参数仅当 mode 为 'topk' 时起作用；
+        通过该值决定两个 CheckpointCallback 实例是否可以共用断点重训的状态；
+        :return:
         """
-        cur_epoch_idx = trainer.cur_epoch_idx
-        global_forward_batches = trainer.global_forward_batches
-        _other = ""
-        if topk:
-            _other = f"_{metric}"
-        return f"epoch_{cur_epoch_idx}-global_batch_{global_forward_batches}-{self._real_monitor}{_other}"
+        return f"model_checkpoint#monitor-{self.monitor}#topK-{self.save_topk}#only_state_dict-{self.only_state_dict}"
+
+    @property
+    def folder_prefix(self):
+        return 'model'
+
+
+class TrainerCheckpointCallback(CheckpointCallback):
+    """
+    保存 Trainer checkpoint 的  callback ，其保存的文件目录以及文件名命名规则如下
+
+    - save_folder/
+        - YYYY-mm-dd-HH_MM_SS_fffff/  # 自动根据当前脚本的启动时间创建的
+            - trainer-epoch_{epoch_idx}/  # 满足 save_every_n_epochs 条件保存的模型
+            - trainer-epoch_{epoch_idx}-batch_{global_batch_idx}/  # 满足 save_every_n_batches 保存的模型
+            - trainer-last/  # 最后一个 epoch 的保存
+            - trainer-epoch_{epoch_idx}-batch_{global_batch_idx}-exception_{exception_type}/  # exception时保存。
+            - trainer-epoch_{epoch_idx}-batch_{global_batch_idx}-{monitor}_{monitor_value}/  # 满足topk条件存储文件名
+
+    model_save_fn 为 None ，则以上每个 folder 中，将生成两个文件：fastnlp_trainer.pkl.tar 以及 fastnlp_model.pkl.tar 。
+    若 model_save_fn 不为 None，则 fastNLP 只会在每个 folder 下生成 fastnlp_trainer.pkl.tar 文件。
+
+    :param monitor: 监控的 metric 的名称。如果在 evaluation 结果中没有找到完全一致的名称，将使用 最短公共字符串算法 找到最匹配
+        的那个作为 monitor 。
+    :param save_folder: 保存的文件夹，fastNLP 将在该文件下以时间戳创建子文件夹，并在里面保存。因此不同次运行可以将被保存到不同的
+        时间戳文件夹中。如果为 None ，默认使用当前文件夹。
+    :param save_every_n_epochs: 多少个 epoch 保存一次。
+    :param save_every_n_batches: 多少个 batch 保存一次。
+    :param save_last: 如果为 True ，将在每次 epoch 运行结束都保存一次，会覆盖之前的保存。
+    :param save_topk: 保存 monitor 结果 topK 个。
+    :param save_on_exception: 在出异常信息时，是否保存。
+    :param larger_better: monitor 的值是否时越大越好。
+    :param only_state_dict: 保存模型时是否只保存 state_dict 。当 model_save_fn 不为 None 时，该参数无意义。
+    :param model_save_fn: 个性化的保存函数，当触发保存操作时，就调用这个函数，这个函数应当接受一个文件夹作为参数，不返回任何东西。
+        如果传入了 model_save_fn 函数，fastNLP 将不再进行模型相关的保存。在多卡场景下，我们只在 rank 0 上会运行该函数。
+    :param kwargs:
+    """
+    @property
+    def save_fn_name(self):
+        return 'save'
 
     @property
     def callback_name(self):
@@ -262,6 +334,8 @@ class CheckpointCallback(Callback):
         通过该值决定两个 CheckpointCallback 实例是否可以共用断点重训的状态；
         :return:
         """
-        return f"monitor-{self.monitor}#trainer_checkpoint-{self.is_trainer_checkpoint}#only_state_dict-{self.only_state_dict}"
-
+        return f"trainer_checkpoint#monitor-{self.monitor}#topK-{self.save_topk}#only_state_dict-{self.only_state_dict}"
 
+    @property
+    def folder_prefix(self):
+        return 'trainer'
diff --git a/fastNLP/core/callbacks/load_best_model_callback.py b/fastNLP/core/callbacks/load_best_model_callback.py
index b4ef4e62..e7b94f8c 100644
--- a/fastNLP/core/callbacks/load_best_model_callback.py
+++ b/fastNLP/core/callbacks/load_best_model_callback.py
@@ -31,7 +31,7 @@ class LoadBestModelCallback(Callback):
             请在函数内完成对模型的保存。
         :param model_load_fn: 加载 model 的函数，与 model_save_fn 必须同时不为空。本函数的输入为一个已经创建好的文件夹，没有输出，
             请在函数内完成对模型的加载。
-        :param delete_after_train: 在加载了最佳模型之后是否删掉模型。
+        :param delete_after_train: 在训练结束后是否删掉模型。
         """
         if model_load_fn is not None:
             assert callable(model_load_fn), "`model_load_fn` must be a callable object."
diff --git a/fastNLP/core/controllers/evaluator.py b/fastNLP/core/controllers/evaluator.py
index f58a7faf..bd66d0a0 100644
--- a/fastNLP/core/controllers/evaluator.py
+++ b/fastNLP/core/controllers/evaluator.py
@@ -133,17 +133,18 @@ class Evaluator:
 
         self.driver.barrier()
 
-    def run(self, num_eval_batch_per_dl: int = -1) -> Dict:
+    def run(self, num_eval_batch_per_dl: int = -1, **kwargs) -> Dict:
         """
         返回一个字典类型的数据，其中key为metric的名字，value为对应metric的结果。
-        如果存在多个metric，一个dataloader的情况，key的命名规则是
-            metric_indicator_name#metric_name
-        如果存在多个数据集，一个metric的情况，key的命名规则是
-            metric_indicator_name#dataloader_name (其中 # 是默认的 separator ，可以通过 Evaluator 初始化参数修改)。
-        如果存在多个metric，多个dataloader的情况，key的命名规则是
-            metric_indicator_name#metric_name#dataloader_name
-        :param num_eval_batch_per_dl: 每个 dataloader 测试多少个 batch 的数据，-1 为测试所有数据。
+            如果存在多个metric，一个dataloader的情况，key的命名规则是
+                metric_indicator_name#metric_name
+            如果存在多个数据集，一个metric的情况，key的命名规则是
+                metric_indicator_name#metric_name#dataloader_name (其中 # 是默认的 separator ，可以通过 Evaluator 初始化参数修改)。
+            如果存在多个metric，多个dataloader的情况，key的命名规则是
+                metric_indicator_name#metric_name#dataloader_name
+            其中 metric_indicator_name 可能不存在。
 
+        :param num_eval_batch_per_dl: 每个 dataloader 测试多少个 batch 的数据，-1 为测试所有数据。
         :return:
         """
         assert isinstance(num_eval_batch_per_dl, int), "num_eval_batch_per_dl must be of int type."
@@ -157,7 +158,6 @@ class Evaluator:
             assert self.driver.has_test_dataloaders()
 
         metric_results = {}
-
         self.reset()
         evaluate_context = self.driver.get_evaluate_context()
         self.driver.set_model_mode(mode='eval' if self.model_use_eval_mode else 'train')
diff --git a/fastNLP/core/controllers/trainer.py b/fastNLP/core/controllers/trainer.py
index 9e1ccfbf..b7456b61 100644
--- a/fastNLP/core/controllers/trainer.py
+++ b/fastNLP/core/controllers/trainer.py
@@ -251,7 +251,7 @@ class Trainer(TrainerEventTrigger):
         self.driver.set_deterministic_dataloader(self.dataloader)
 
         self.dataloader = self.driver.set_dist_repro_dataloader(dataloader=self.train_dataloader, dist=_dist_sampler,
-                                                                reproducible=self.callback_manager.has_trainer_chechpoint)
+                                                                reproducible=self.callback_manager.has_trainer_checkpoint)
 
         self.set_grad_to_none = kwargs.get("set_grad_to_none", True)
         self.on_after_trainer_initialized(self.driver)
@@ -291,6 +291,7 @@ class Trainer(TrainerEventTrigger):
                 raise FileNotFoundError("You are using `resume_from`, but we can not find your specific file.")
 
         if self.evaluator is not None and num_eval_sanity_batch > 0:
+            logger.info(f"Running evaluator sanity check for {num_eval_sanity_batch} batches.")
             self.on_sanity_check_begin()
             sanity_check_res = self.evaluator.run(num_eval_batch_per_dl=num_eval_sanity_batch)
             self.on_sanity_check_end(sanity_check_res)
@@ -509,7 +510,7 @@ class Trainer(TrainerEventTrigger):
 
         :param folder: 保存模型的地址；
         :param only_state_dict: 是否只保存模型的 `state_dict`；
-        :param save_fn: 用户自己定制的用来替换该保存函数本身保存逻辑的函数；
+        :param model_save_fn: 用户自己定制的用来替换该保存函数本身保存逻辑的函数；
         :param kwargs: 一些 driver 的保存模型的函数的参数另有其它；
         """
 
@@ -534,7 +535,16 @@ class Trainer(TrainerEventTrigger):
 
     def load_model(self, folder: Union[str, Path, BinaryIO, io.BytesIO], only_state_dict: bool = False,
                    model_load_fn: Optional[Callable] = None, **kwargs):
+        """
+        加载模型
 
+        :param folder: 读取 model 的文件夹，默认会尝试读取该文件夹下的 fastnlp_model.pkl.tar 文件。在 model_load_fn 不为空时，
+            直接将该 folder 传递到 model_load_fn 中。
+        :param only_state_dict: 要读取的文件中是否仅包含模型权重。在 model_load_fn 不为 None 时，该参数无意义。
+        :param model_load_fn: callable 的函数，接受一个 folder 作为参数，不返回任何内容。
+        :param kwargs:
+        :return:
+        """
         self.on_load_model()
         self.driver.barrier()
         if not isinstance(folder, (io.BytesIO, BinaryIO)):
@@ -555,7 +565,13 @@ class Trainer(TrainerEventTrigger):
 
     def save(self, folder: Union[str, Path], only_state_dict: bool = True, model_save_fn: Optional[Callable] = None, **kwargs):
         r"""
-        用于断点重训的保存函数;
+        用于断点重训 Trainer 的保存函数;
+
+        :param folder:
+        :param only_state_dict:
+        :param model_save_fn:
+        :param kwargs:
+        :return:
         """
         self.driver.barrier()
 
diff --git a/fastNLP/core/dataset/dataset.py b/fastNLP/core/dataset/dataset.py
index 037fde00..9630a3a0 100644
--- a/fastNLP/core/dataset/dataset.py
+++ b/fastNLP/core/dataset/dataset.py
@@ -8,9 +8,8 @@ __all__ = [
 
 import _pickle as pickle
 from copy import deepcopy
-from typing import Optional, List, Callable, Union, Dict, Any
+from typing import Optional, List, Callable, Union, Dict, Any, Mapping
 from functools import partial
-import warnings
 
 import numpy as np
 from threading import Thread
@@ -197,6 +196,20 @@ class DataSet:
         else:
             raise KeyError("Unrecognized type {} for idx in __getitem__ method".format(type(idx)))
 
+    def __setitem__(self, key, value):
+        assert isinstance(key, int) and key<len(self)
+        assert isinstance(value, Instance) or isinstance(value, Mapping)
+        ins_keys = set(value.keys())
+        ds_keys = set(self.get_field_names())
+
+        if len(ins_keys - ds_keys) != 0:
+            raise KeyError(f"The following keys are not found in the Dataset:{list(ins_keys - ds_keys)}.")
+        if len(ds_keys - ins_keys) != 0:
+            raise KeyError(f"The following keys are not found in the Instance:{list(ds_keys - ins_keys)}.")
+
+        for field_name, field in self.field_arrays.items():
+            field[key] = value[field_name]
+
     def __getattribute__(self, item):
         return object.__getattribute__(self, item)
 
@@ -813,6 +826,3 @@ class DataSet:
         self.collate_fns.set_input(*field_names)
 
 
-class IterableDataset:
-    pass
-
diff --git a/fastNLP/core/dataset/field.py b/fastNLP/core/dataset/field.py
index 691cbb02..42ba700e 100644
--- a/fastNLP/core/dataset/field.py
+++ b/fastNLP/core/dataset/field.py
@@ -46,9 +46,6 @@ class FieldArray:
 
     def __setitem__(self, idx: int, val: Any):
         assert isinstance(idx, int)
-        if idx == -1:
-            idx = len(self) - 1
-        assert 0 <= idx < len(self), f"0<= idx <{len(self)}, but idx is {idx}"
         self.content[idx] = val
 
     def get(self, indices: Union[int, List[int]]):
@@ -79,7 +76,7 @@ class FieldArray:
 
     def split(self, sep: str = None, inplace: bool = True):
         r"""
-        依次对自身的元素使用.split()方法，应该只有当本field的元素为str时，该方法才有用。将返回值
+        依次对自身的元素使用.split()方法，应该只有当本field的元素为str时，该方法才有用。
 
         :param sep: 分割符，如果为None则直接调用str.split()。
         :param inplace: 如果为True，则将新生成值替换本field。否则返回list。
diff --git a/fastNLP/core/drivers/driver.py b/fastNLP/core/drivers/driver.py
index 4b141761..710bf6be 100644
--- a/fastNLP/core/drivers/driver.py
+++ b/fastNLP/core/drivers/driver.py
@@ -6,6 +6,7 @@ from abc import ABC, abstractmethod
 from datetime import datetime
 from pathlib import Path
 from io import BytesIO
+import json
 
 __all__ = [
     'Driver'
@@ -68,9 +69,12 @@ class Driver(ABC):
     def set_sampler_epoch(self, dataloader, cur_epoch_idx):
         r"""
         对于分布式的 sampler，例如 torch 的 DistributedSampler，其需要在每一个 epoch 前设置随机数种子，来保证每一个进程上的 shuffle 是一样的；
+            dataloader 中可能真正发挥作用的是 batch_sampler 也可能是 sampler。
 
+        :param dataloader: 需要设置 epoch 的 dataloader 。
         :param cur_epoch_idx: 当前是第几个 epoch；
         """
+
     @abstractmethod
     def train_step(self, batch):
         """
@@ -444,13 +448,14 @@ class Driver(ABC):
 
             exc_type, exc_value, exc_traceback_obj = sys.exc_info()
             _write_exc_info = {
-                'exc_type': exc_type,
-                'exc_value': exc_value,
-                'time': str(datetime.now().strftime('%Y-%m-%d-%H:%M:%S')),
-                'global_rank': getattr(self, "global_rank", None),
-                'rank': self.get_local_rank(),
+                'exc_type': str(exc_type.__name__),
+                'exc_value': str(exc_value),
+                'exc_time': str(datetime.now().strftime('%Y-%m-%d-%H:%M:%S')),
+                'exc_global_rank': getattr(self, "global_rank", None),
+                'exc_local_rank': self.get_local_rank(),
             }
-            sys.stderr.write(str(_write_exc_info)+"\n")
+            sys.stderr.write("\nException info:\n")
+            sys.stderr.write(json.dumps(_write_exc_info, indent=2)+"\n")
 
             sys.stderr.write(f"Start to stop these pids:{self._pids}, please wait several seconds.\n")
             for pid in self._pids:
diff --git a/fastNLP/core/drivers/torch_driver/initialize_torch_driver.py b/fastNLP/core/drivers/torch_driver/initialize_torch_driver.py
index 9cd1ac01..2c9c5162 100644
--- a/fastNLP/core/drivers/torch_driver/initialize_torch_driver.py
+++ b/fastNLP/core/drivers/torch_driver/initialize_torch_driver.py
@@ -27,7 +27,7 @@ def initialize_torch_driver(driver: str, device: Optional[Union[str, torch.devic
     # world_size 和 rank
     if FASTNLP_BACKEND_LAUNCH in os.environ:
         if device is not None:
-            logger.warning("Parameter `device` would be ignored when you are using `torch.distributed.run` to pull "
+            logger.info("Parameter `device` would be ignored when you are using `torch.distributed.run` to pull "
                            "up your script. And we will directly get the local device via "
                            "`os.environ['LOCAL_RANK']`.")
         return TorchDDPDriver(model, torch.device(f"cuda:{os.environ['LOCAL_RANK']}"), True, **kwargs)
@@ -65,7 +65,7 @@ def initialize_torch_driver(driver: str, device: Optional[Union[str, torch.devic
         if not isinstance(device, List):
             return TorchSingleDriver(model, device, **kwargs)
         else:
-            logger.warning("Notice you are using `torch` driver but your chosen `device` are multi gpus, we will use "
+            logger.info("Notice you are using `torch` driver but your chosen `device` are multi gpus, we will use "
                            "`TorchDDPDriver` by default. But if you mean using `TorchDDPDriver`, you should choose parameter"
                            "`driver` as `TorchDDPDriver`.")
             return TorchDDPDriver(model, device, **kwargs)
diff --git a/fastNLP/core/drivers/torch_driver/torch_driver.py b/fastNLP/core/drivers/torch_driver/torch_driver.py
index 66c93d4d..369e4432 100644
--- a/fastNLP/core/drivers/torch_driver/torch_driver.py
+++ b/fastNLP/core/drivers/torch_driver/torch_driver.py
@@ -143,8 +143,6 @@ class TorchDriver(Driver):
 
         :param filepath: 保存到哪个文件夹；
         :param only_state_dict: 是否只保存权重；
-        :param model_save_fn:
-
         :return:
         """
         model = self.unwrap_model()
diff --git a/fastNLP/core/utils/utils.py b/fastNLP/core/utils/utils.py
index 66159f24..0d497bc2 100644
--- a/fastNLP/core/utils/utils.py
+++ b/fastNLP/core/utils/utils.py
@@ -44,6 +44,9 @@ __all__ = [
 ]
 
 
+
+
+
 def get_fn_arg_names(fn: Callable) -> List[str]:
     r"""
     返回一个函数的所有参数的名字；
diff --git a/fastNLP/envs/set_env_on_import.py b/fastNLP/envs/set_env_on_import.py
index 38b79b44..0e67cf20 100644
--- a/fastNLP/envs/set_env_on_import.py
+++ b/fastNLP/envs/set_env_on_import.py
@@ -65,7 +65,7 @@ def set_env_on_import():
 
     # fastNLP 内部使用的一些变量
     if FASTNLP_LAUNCH_TIME not in os.environ:
-        cur_time = f"{datetime.datetime.now().strftime('%Y-%m-%d-%H_%M_%S_%M_%f')}"
+        cur_time = f"{datetime.datetime.now().strftime('%Y-%m-%d-%H_%M_%S_%f')}"
         os.environ[FASTNLP_LAUNCH_TIME] = cur_time
 
     # 设置对应的值
diff --git a/tests/core/callbacks/test_checkpoint_callback_torch.py b/tests/core/callbacks/test_checkpoint_callback_torch.py
index f7cc6e5f..1f404bb8 100644
--- a/tests/core/callbacks/test_checkpoint_callback_torch.py
+++ b/tests/core/callbacks/test_checkpoint_callback_torch.py
@@ -8,7 +8,7 @@ import torch.distributed as dist
 from pathlib import Path
 import re
 
-from fastNLP.core.callbacks.checkpoint_callback import CheckpointCallback
+from fastNLP.core.callbacks.checkpoint_callback import ModelCheckpointCallback, TrainerCheckpointCallback
 from fastNLP.core.controllers.trainer import Trainer
 from fastNLP.envs import FASTNLP_MODEL_FILENAME, FASTNLP_CHECKPOINT_FILENAME, FASTNLP_LAUNCH_TIME, FASTNLP_DISTRIBUTED_CHECK
 
@@ -80,16 +80,23 @@ def test_model_checkpoint_callback_1(
     version,
     only_state_dict
 ):
+# def test_model_checkpoint_callback_1(
+#         model_and_optimizers: TrainerParameters,
+#         driver='torch_ddp',
+#         device=[0, 1],
+#         version=1,
+#         only_state_dict=True
+# ):
     path = Path.cwd().joinpath(f"test_model_checkpoint")
     path.mkdir(exist_ok=True, parents=True)
 
     if version == 0:
         callbacks = [
-            CheckpointCallback(
+            ModelCheckpointCallback(
                 monitor="acc",
                 save_folder=path,
                 save_every_n_epochs=1,
-                save_every_n_global_batches=123,  # 避免和 epoch 的保存重复；
+                save_every_n_batches=123,  # 避免和 epoch 的保存重复；
                 save_topk=None,
                 save_last=False,
                 save_on_exception=None,
@@ -98,11 +105,11 @@ def test_model_checkpoint_callback_1(
         ]
     elif version == 1:
         callbacks = [
-            CheckpointCallback(
+            ModelCheckpointCallback(
                 monitor="acc",
                 save_folder=path,
                 save_every_n_epochs=3,
-                save_every_n_global_batches=None,
+                save_every_n_batches=None,
                 save_topk=2,
                 save_last=True,
                 save_on_exception=None,
@@ -121,7 +128,6 @@ def test_model_checkpoint_callback_1(
             input_mapping=model_and_optimizers.input_mapping,
             output_mapping=model_and_optimizers.output_mapping,
             metrics=model_and_optimizers.metrics,
-
             n_epochs=10,
             callbacks=callbacks,
             output_from_new_proc="all"
@@ -134,31 +140,31 @@ def test_model_checkpoint_callback_1(
         if version == 0:
 
             if driver == "torch":
-                assert "epoch_10-global_batch_250-acc" in all_saved_model_paths
-                assert "epoch_4-global_batch_123-acc" in all_saved_model_paths
+                assert "model-epoch_10" in all_saved_model_paths
+                assert "model-epoch_4-batch_123" in all_saved_model_paths
 
-                epoch_save_path = all_saved_model_paths["epoch_10-global_batch_250-acc"]
-                step_save_path = all_saved_model_paths["epoch_4-global_batch_123-acc"]
+                epoch_save_path = all_saved_model_paths["model-epoch_10"]
+                step_save_path = all_saved_model_paths["model-epoch_4-batch_123"]
 
                 assert len(all_saved_model_paths) == 12
             # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
             else:
-                assert "epoch_6-global_batch_78-acc" in all_saved_model_paths
-                assert "epoch_9-global_batch_123-acc" in all_saved_model_paths
+                assert "model-epoch_6" in all_saved_model_paths
+                assert "model-epoch_9-batch_123" in all_saved_model_paths
 
-                epoch_save_path = all_saved_model_paths["epoch_6-global_batch_78-acc"]
-                step_save_path = all_saved_model_paths["epoch_9-global_batch_123-acc"]
+                epoch_save_path = all_saved_model_paths["model-epoch_6"]
+                step_save_path = all_saved_model_paths["model-epoch_9-batch_123"]
 
                 assert len(all_saved_model_paths) == 11
             all_state_dicts = [epoch_save_path, step_save_path]
 
         elif version == 1:
 
-            pattern = re.compile("epoch_[0-9]+-global_batch_[0-9]+-[a-z|A-Z]+_[0-9]*.?[0-9]*")
+            pattern = re.compile("model-epoch_[0-9]+-batch_[0-9]+-[a-zA-Z#]+_[0-9]*.?[0-9]*")
 
             if driver == "torch":
-                assert "epoch_9-global_batch_225-acc" in all_saved_model_paths
-                assert "last" in all_saved_model_paths
+                assert "model-epoch_9" in all_saved_model_paths
+                assert "model-last" in all_saved_model_paths
                 aLL_topk_folders = []
                 for each_folder_name in all_saved_model_paths:
                     each_folder_name = pattern.findall(each_folder_name)
@@ -166,15 +172,15 @@ def test_model_checkpoint_callback_1(
                         aLL_topk_folders.append(each_folder_name[0])
                 assert len(aLL_topk_folders) == 2
 
-                epoch_save_path = all_saved_model_paths["epoch_9-global_batch_225-acc"]
-                last_save_path = all_saved_model_paths["last"]
+                epoch_save_path = all_saved_model_paths["model-epoch_9"]
+                last_save_path = all_saved_model_paths["model-last"]
                 topk_save_path = all_saved_model_paths[aLL_topk_folders[0]]
 
                 assert len(all_saved_model_paths) == 6
             # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
             else:
-                assert "epoch_9-global_batch_117-acc" in all_saved_model_paths
-                assert "last" in all_saved_model_paths
+                assert "model-epoch_9" in all_saved_model_paths
+                assert "model-last" in all_saved_model_paths
 
                 aLL_topk_folders = []
                 for each_folder_name in all_saved_model_paths:
@@ -183,8 +189,8 @@ def test_model_checkpoint_callback_1(
                         aLL_topk_folders.append(each_folder_name[0])
                 assert len(aLL_topk_folders) == 2
 
-                epoch_save_path = all_saved_model_paths["epoch_9-global_batch_117-acc"]
-                last_save_path = all_saved_model_paths["last"]
+                epoch_save_path = all_saved_model_paths["model-epoch_9"]
+                last_save_path = all_saved_model_paths["model-last"]
                 topk_save_path = all_saved_model_paths[aLL_topk_folders[0]]
 
                 assert len(all_saved_model_paths) == 6
@@ -212,7 +218,7 @@ def test_model_checkpoint_callback_1(
 
     finally:
         synchronize_safe_rm(path)
-        # pass
+        pass
 
     if dist.is_initialized():
         dist.destroy_process_group()
@@ -238,11 +244,11 @@ def test_model_checkpoint_callback_2(
             raise NotImplementedError
 
     callbacks = [
-        CheckpointCallback(
+        ModelCheckpointCallback(
             monitor="acc1",
             save_folder=path,
             save_every_n_epochs=None,
-            save_every_n_global_batches=None,
+            save_every_n_batches=None,
             save_topk=None,
             save_last=False,
             save_on_exception=NotImplementedError,
@@ -279,12 +285,12 @@ def test_model_checkpoint_callback_2(
         all_saved_model_paths = {w.name: w for w in path.joinpath(os.environ[FASTNLP_LAUNCH_TIME]).iterdir()}
 
         if driver == "torch":
-            assert "epoch_4-global_batch_100-acc_NotImplementedError" in all_saved_model_paths
-            exception_model_path = all_saved_model_paths["epoch_4-global_batch_100-acc_NotImplementedError"]
+            assert "model-epoch_4-batch_100-exception_NotImplementedError" in all_saved_model_paths
+            exception_model_path = all_saved_model_paths["model-epoch_4-batch_100-exception_NotImplementedError"]
         # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
         else:
-            assert "epoch_4-global_batch_52-acc_NotImplementedError" in all_saved_model_paths
-            exception_model_path = all_saved_model_paths["epoch_4-global_batch_52-acc_NotImplementedError"]
+            assert "model-epoch_4-batch_52-exception_NotImplementedError" in all_saved_model_paths
+            exception_model_path = all_saved_model_paths["model-epoch_4-batch_52-exception_NotImplementedError"]
 
         assert len(all_saved_model_paths) == 1
         all_state_dicts = [exception_model_path]
@@ -332,12 +338,11 @@ def test_trainer_checkpoint_callback_1(
 
     if version == 0:
         callbacks = [
-            CheckpointCallback(
+            TrainerCheckpointCallback(
                 monitor="acc",
-                is_trainer_checkpoint=True,
                 save_folder=path,
                 save_every_n_epochs=7,
-                save_every_n_global_batches=123,  # 避免和 epoch 的保存重复；
+                save_every_n_batches=123,  # 避免和 epoch 的保存重复；
                 save_topk=None,
                 save_last=False,
                 save_on_exception=None,
@@ -346,12 +351,11 @@ def test_trainer_checkpoint_callback_1(
         ]
     elif version == 1:
         callbacks = [
-            CheckpointCallback(
+            TrainerCheckpointCallback(
                 monitor="acc",
-                is_trainer_checkpoint=True,
                 save_folder=path,
                 save_every_n_epochs=None,
-                save_every_n_global_batches=None,
+                save_every_n_batches=None,
                 save_topk=2,
                 save_last=True,
                 save_on_exception=None,
@@ -383,31 +387,31 @@ def test_trainer_checkpoint_callback_1(
         if version == 0:
 
             if driver == "torch":
-                assert "epoch_7-global_batch_175-acc" in all_saved_model_paths
-                assert "epoch_4-global_batch_123-acc" in all_saved_model_paths
+                assert "trainer-epoch_7" in all_saved_model_paths
+                assert "trainer-epoch_4-batch_123" in all_saved_model_paths
 
-                epoch_save_path = all_saved_model_paths["epoch_7-global_batch_175-acc"]
-                step_save_path = all_saved_model_paths["epoch_4-global_batch_123-acc"]
+                epoch_save_path = all_saved_model_paths["trainer-epoch_7"]
+                step_save_path = all_saved_model_paths["trainer-epoch_4-batch_123"]
 
                 assert len(all_saved_model_paths) == 3
             # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
             else:
-                assert "epoch_7-global_batch_91-acc" in all_saved_model_paths
-                assert "epoch_9-global_batch_123-acc" in all_saved_model_paths
+                assert "trainer-epoch_7" in all_saved_model_paths
+                assert "trainer-epoch_9-batch_123" in all_saved_model_paths
 
-                epoch_save_path = all_saved_model_paths["epoch_7-global_batch_91-acc"]
-                step_save_path = all_saved_model_paths["epoch_9-global_batch_123-acc"]
+                epoch_save_path = all_saved_model_paths["trainer-epoch_7"]
+                step_save_path = all_saved_model_paths["trainer-epoch_9-batch_123"]
 
                 assert len(all_saved_model_paths) == 2
             all_state_dicts = [epoch_save_path, step_save_path]
 
         elif version == 1:
 
-            pattern = re.compile("epoch_[0-9]+-global_batch_[0-9]+-[a-z|A-Z]+_[0-9]*.?[0-9]*")
+            pattern = re.compile("trainer-epoch_[0-9]+-batch_[0-9]+-[a-zA-Z#]+_[0-9]*.?[0-9]*")
 
             # all_saved_model_paths = {w.name: w for w in path.joinpath(os.environ[FASTNLP_LAUNCH_TIME]).iterdir()}
             if driver == "torch":
-                assert "last" in all_saved_model_paths
+                assert "trainer-last" in all_saved_model_paths
                 aLL_topk_folders = []
                 for each_folder_name in all_saved_model_paths:
                     each_folder_name = pattern.findall(each_folder_name)
@@ -415,13 +419,13 @@ def test_trainer_checkpoint_callback_1(
                         aLL_topk_folders.append(each_folder_name[0])
                 assert len(aLL_topk_folders) == 2
 
-                last_save_path = all_saved_model_paths["last"]
+                last_save_path = all_saved_model_paths["trainer-last"]
                 topk_save_path = all_saved_model_paths[aLL_topk_folders[0]]
 
                 assert len(all_saved_model_paths) == 3
             # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
             else:
-                assert "last" in all_saved_model_paths
+                assert "trainer-last" in all_saved_model_paths
 
                 aLL_topk_folders = []
                 for each_folder_name in all_saved_model_paths:
@@ -430,7 +434,7 @@ def test_trainer_checkpoint_callback_1(
                         aLL_topk_folders.append(each_folder_name[0])
                 assert len(aLL_topk_folders) == 2
 
-                last_save_path = all_saved_model_paths["last"]
+                last_save_path = all_saved_model_paths["trainer-last"]
                 topk_save_path = all_saved_model_paths[aLL_topk_folders[0]]
 
                 assert len(all_saved_model_paths) == 3
@@ -474,10 +478,11 @@ def test_trainer_checkpoint_callback_2(
     device,
     version
 ):
+    pytest.skip("Skip transformers test for now.")
     path = Path.cwd().joinpath(f"test_model_checkpoint")
     path.mkdir(exist_ok=True, parents=True)
 
-    import transformers
+    import transformers  # 版本4.16.2
     import torch
     from torchmetrics import Accuracy
     from transformers import AutoModelForSequenceClassification
@@ -587,12 +592,11 @@ def test_trainer_checkpoint_callback_2(
 
     if version == 0:
         callbacks = [
-            CheckpointCallback(
+            TrainerCheckpointCallback(
                 monitor="acc",
-                is_trainer_checkpoint=True,
                 save_folder=path,
                 save_every_n_epochs=None,
-                save_every_n_global_batches=50,
+                save_every_n_batches=50,
                 save_topk=None,
                 save_last=False,
                 save_on_exception=None,
@@ -601,12 +605,11 @@ def test_trainer_checkpoint_callback_2(
         ]
     elif version == 1:
         callbacks = [
-            CheckpointCallback(
+            TrainerCheckpointCallback(
                 monitor="acc",
-                is_trainer_checkpoint=True,
                 save_folder=path,
                 save_every_n_epochs=None,
-                save_every_n_global_batches=None,
+                save_every_n_batches=None,
                 save_topk=1,
                 save_last=True,
                 save_on_exception=None,
@@ -638,27 +641,27 @@ def test_trainer_checkpoint_callback_2(
         if version == 0:
 
             if driver == "torch":
-                assert "epoch_1-global_batch_200-acc" in all_saved_model_paths
+                assert "trainer-epoch_1-batch_200" in all_saved_model_paths
 
-                epoch_save_path = all_saved_model_paths["epoch_1-global_batch_200-acc"]
+                epoch_save_path = all_saved_model_paths["trainer-epoch_1-batch_200"]
 
                 assert len(all_saved_model_paths) == 4
             # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
             else:
-                assert "epoch_1-global_batch_100-acc" in all_saved_model_paths
+                assert "trainer-epoch_1-batch_100" in all_saved_model_paths
 
-                epoch_save_path = all_saved_model_paths["epoch_1-global_batch_100-acc"]
+                epoch_save_path = all_saved_model_paths["trainer-epoch_1-batch_100"]
 
                 assert len(all_saved_model_paths) == 2
             all_state_dicts = [epoch_save_path]
 
         elif version == 1:
 
-            pattern = re.compile("epoch_[0-9]+-global_batch_[0-9]+-[a-z|A-Z]+_[0-9]*.?[0-9]*")
+            pattern = re.compile("trainer-epoch_[0-9]+-batch_[0-9]+-[a-zA-Z#]+_[0-9]*.?[0-9]*")
 
             # all_saved_model_paths = {w.name: w for w in path.joinpath(os.environ[FASTNLP_LAUNCH_TIME]).iterdir()}
             if driver == "torch":
-                assert "last" in all_saved_model_paths
+                assert "trainer-last" in all_saved_model_paths
                 aLL_topk_folders = []
                 for each_folder_name in all_saved_model_paths:
                     each_folder_name = pattern.findall(each_folder_name)
@@ -666,13 +669,13 @@ def test_trainer_checkpoint_callback_2(
                         aLL_topk_folders.append(each_folder_name[0])
                 assert len(aLL_topk_folders) == 1
 
-                last_save_path = all_saved_model_paths["last"]
+                last_save_path = all_saved_model_paths["trainer-last"]
                 topk_save_path = all_saved_model_paths[aLL_topk_folders[0]]
 
                 assert len(all_saved_model_paths) == 2
             # ddp 下的文件名不同，因为同样的数据，ddp 用了更少的步数跑完；
             else:
-                assert "last" in all_saved_model_paths
+                assert "trainer-last" in all_saved_model_paths
 
                 aLL_topk_folders = []
                 for each_folder_name in all_saved_model_paths:
@@ -681,7 +684,7 @@ def test_trainer_checkpoint_callback_2(
                         aLL_topk_folders.append(each_folder_name[0])
                 assert len(aLL_topk_folders) == 1
 
-                last_save_path = all_saved_model_paths["last"]
+                last_save_path = all_saved_model_paths["trainer-last"]
                 topk_save_path = all_saved_model_paths[aLL_topk_folders[0]]
 
                 assert len(all_saved_model_paths) == 2
diff --git a/tests/core/dataset/test_dataset.py b/tests/core/dataset/test_dataset.py
index 78c48c54..3998ec21 100644
--- a/tests/core/dataset/test_dataset.py
+++ b/tests/core/dataset/test_dataset.py
@@ -105,6 +105,20 @@ class TestDataSetMethods(unittest.TestCase):
         self.assertTrue(isinstance(field_array, FieldArray))
         self.assertEqual(len(field_array), 40)
 
+    def test_setitem(self):
+        ds = DataSet({"x": [[1, 2, 3, 4]] * 40, "y": [[5, 6]] * 40})
+        ds.add_field('i', list(range(len(ds))))
+        assert ds.get_field('i').content == list(range(len(ds)))
+        import random
+        random.shuffle(ds)
+        import numpy as np
+        np.random.shuffle(ds)
+        assert ds.get_field('i').content != list(range(len(ds)))
+
+        ins1 = ds[1]
+        ds[2] = ds[1]
+        assert ds[2]['x'] == ins1['x'] and ds[2]['y'] == ins1['y']
+
     def test_get_item_error(self):
         with self.assertRaises(RuntimeError):
             ds = DataSet({"x": [[1, 2, 3, 4]] * 10, "y": [[5, 6]] * 10})