diff --git a/mindinsight/mindconverter/graph_based_converter/common/code_fragment.py b/mindinsight/mindconverter/graph_based_converter/common/code_fragment.py
index e0a228bf..108d543e 100644
--- a/mindinsight/mindconverter/graph_based_converter/common/code_fragment.py
+++ b/mindinsight/mindconverter/graph_based_converter/common/code_fragment.py
@@ -27,8 +27,9 @@ class Fragment(abc.ABC):
     Args:
         operation (str): Operation name in MindSpore.
         actual_args (dict): Actual arg values.
+        input_shape (tuple): The input shape of the node.
+        output_shape (tuple): The output shape of the node.
         settings (namedTuple): Code generation setting.
-
     """
 
     def __init__(self, operation, actual_args, input_shape, output_shape, settings=None):
@@ -46,6 +47,7 @@ class Fragment(abc.ABC):
 
     @property
     def code_setting(self):
+        """Code Setting getter."""
         return self._code_setting
 
     @property
@@ -152,10 +154,12 @@ class Fragment(abc.ABC):
 
     @property
     def input_shape(self):
+        """Return the input shape."""
         return self._input_shape
 
     @property
     def output_shape(self):
+        """Return the output shape."""
         return self._output_shape
 
 
@@ -196,6 +200,7 @@ class CodeFragment(Fragment):
 
     @property
     def trainable_params(self):
+        """Return the trainable parameters."""
         return self._trainable_params
 
 
diff --git a/mindinsight/mindconverter/graph_based_converter/common/global_context.py b/mindinsight/mindconverter/graph_based_converter/common/global_context.py
index 836c911c..64a723d8 100644
--- a/mindinsight/mindconverter/graph_based_converter/common/global_context.py
+++ b/mindinsight/mindconverter/graph_based_converter/common/global_context.py
@@ -1,4 +1,4 @@
-# Copyright 2020 Huawei Technologies Co., Ltd.All Rights Reserved.
+# Copyright 2020-2021 Huawei Technologies Co., Ltd.All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,6 +14,7 @@
 # ==============================================================================
 """Define GlobalContext class to save required resources during whole conversion procedure."""
 from collections import OrderedDict
+from .outputs import OutputStorage
 
 
 class Singleton(type):
@@ -45,6 +46,7 @@ class GlobalContext(metaclass=Singleton):
         self.onnx_node_name_to_topo_idx = dict()
         self.onnx_node_inputs = dict()
         self._onnx_tensors_collection = dict()
+        self.onnx_graph_info = dict()
 
         # Define data stored from generator
         # Key as Node Identifier
@@ -72,6 +74,8 @@ class GlobalContext(metaclass=Singleton):
         # key is target node (which use this opt), value is opt_var_name
         self.extra_input_dict = dict()
 
+        self.outputs_storage = OutputStorage()
+
     def get_onnx_node_from_identifier(self, identifier):
         """Return an OnnxUtils defined node by its identifier."""
         onnx_node_name = self.node_struct_to_onnx_node_map.get(identifier)
diff --git a/mindinsight/mindconverter/graph_based_converter/common/outputs.py b/mindinsight/mindconverter/graph_based_converter/common/outputs.py
new file mode 100644
index 00000000..13d31861
--- /dev/null
+++ b/mindinsight/mindconverter/graph_based_converter/common/outputs.py
@@ -0,0 +1,200 @@
+# Copyright 2021 Huawei Technologies Co., Ltd.All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Define basic classes for generator use."""
+import abc
+import copy
+from typing import Union, Iterable
+
+class BaseOutput:
+    """
+    Define the class of output providing a universal nodes' and modules' output data collection.
+
+    Args:
+        output_mapping (tuple[tuple]): The mapping of outputs from onnx to mindspore.
+    """
+    def __init__(self, output_mapping) -> None:
+        super(BaseOutput).__init__()
+        self.idx_in_ms_provider = output_mapping[0]
+        self.idx_in_onnx_provider = output_mapping[1]
+
+        # For multi users, key as user and value as index
+        self.idx_in_ms_user = dict()
+        self.idx_in_onnx_user = dict()
+
+        # The following attributes to be set by who referenced this object.
+        self.onnx_edge_name = None
+        self.to_external = False
+
+    @property
+    def ms_user(self):
+        """Return the output's user in the MindSpore."""
+        return self.idx_in_ms_user.keys()
+
+    @property
+    def onnx_user(self):
+        """Return the output's user in the ONNX."""
+        return self.idx_in_onnx_user.keys()
+
+    def deepcopy(self):
+        """Return a deepcopy of self instance."""
+        return copy.deepcopy(self)
+
+
+class BaseOutputManager(abc.ABC):
+    """
+    Base Output Manager class.
+
+    Args:
+        output_mappings (list): A list of output mapping.
+    """
+    def __init__(self, output_mappings):
+        if isinstance(self.__class__, ModuleOutputManager):
+            return
+        self._base_output_list = list()
+
+        # init base output obj
+        for mapping in output_mappings:
+            obj = BaseOutput(mapping)
+            self._base_output_list.append(obj)
+
+    @property
+    def outputs(self):
+        """Return the list of BaseOutput in this manager."""
+        return self._base_output_list
+
+    @outputs.setter
+    def outputs(self, val: list):
+        """Set the list of BaseOutput in this manager."""
+        for v in val:
+            if not isinstance(v, BaseOutput):
+                raise TypeError(f"{self.__class__} does not accept the type {type(v)} in the list given.")
+        self._base_output_list = val
+
+    @abc.abstractmethod
+    def deepcopy(self):
+        """Return the deepcopy of this instance."""
+        cls = self.__class__
+        result = cls.__new__(cls)
+        result.outputs = list()
+        for out in self._base_output_list:
+            result.outputs.append(out.deepcopy())
+        return result
+
+
+class NodeOutputManager(BaseOutputManager):
+    """
+    Node Output Manager class.
+
+    Args:
+        identifier (str): The identifier of the node.
+        output_mappings (list): A list of the output mapping.
+    """
+    def __init__(self, identifier, output_mappings=None) -> None:
+        super(NodeOutputManager, self).__init__(output_mappings)
+        self.identifier = identifier
+
+    def deepcopy(self):
+        new_mgr = super().deepcopy()
+        new_mgr.identifier = self.identifier
+        return new_mgr
+
+
+class ModuleOutputManager(BaseOutputManager):
+    """
+    Module Output Manager class.
+
+    Args:
+        identifier (str): The identifier of the module.
+        output_mappings (list): a list of output mapping
+    """
+    def __init__(self, identifier, base_out: Union[BaseOutput, Iterable[BaseOutput]]) -> None:
+        super(ModuleOutputManager, self).__init__(None)
+        self.identifier = identifier
+        self._return_list_counter = 0
+        self._base_output_list = list()
+        if isinstance(base_out, BaseOutput):
+            self._base_output_list.append(base_out)
+        else:
+            self._base_output_list += base_out
+
+    @property
+    def return_num(self):
+        """Return the number of outputs to be returned."""
+        return self._return_list_counter
+
+    @return_num.setter
+    def return_num(self, num: int):
+        """Set the number of outputs to be returned."""
+        self._return_list_counter = num
+
+    def deepcopy(self):
+        """Return a deepcopy of current instance."""
+        new_mgr = super().deepcopy()
+        new_mgr.identifier = self.identifier
+        new_mgr.return_num = self._return_list_counter
+        return new_mgr
+
+
+class OutputStorage:
+    """A class saves all outputs."""
+    def __init__(self):
+        self._base_output_edge_to_instance = dict()
+        self._base_output_edge_to_onnx_node_name = dict()
+        self._base_output_edge_to_ms_identifier = dict()
+
+    @property
+    def outputs_collections(self) -> dict:
+        """Return the dict of edge name to output instance."""
+        return self._base_output_edge_to_instance
+
+    def onnx_name(self, output_edge) -> str:
+        """Return the dict of edge name to onnx node name."""
+        return self._base_output_edge_to_onnx_node_name.get(output_edge)
+
+    def node_identifier(self, output_edge):
+        """Return the dict of edge name to node identifier."""
+        return self._base_output_edge_to_ms_identifier.get(output_edge)
+
+    def add_output(self, out: BaseOutput) -> str:
+        """
+        Add a BaseOutput instance to the storage.
+
+        Args:
+            out (BaseOutput): The BaseOutput instance.
+        """
+        if out.onnx_edge_name:
+            self._base_output_edge_to_instance[out.onnx_edge_name] = out
+        else:
+            raise ValueError("Unable to add a BaseOutput instance with unknown ONNX edge.")
+
+    def add_onnx_node_name(self, edge: str, onnx_node_name: str):
+        """
+        Add the onnx node name with the edge name.
+
+        Args:
+            edge (str): The edge name of this output.
+            onnx_node_name (str): The onnx node which has the edge.
+        """
+        self._base_output_edge_to_onnx_node_name[edge] = onnx_node_name
+
+    def add_ms_identifier(self, edge: str, ms_identifier: str):
+        """
+        Add the node identifier with the edge name.
+
+        Args:
+            edge (str): The edge name of this output.
+            ms_identifier (str): The identifier of the node which has the edge.
+        """
+        self._base_output_edge_to_ms_identifier[edge] = ms_identifier
diff --git a/mindinsight/mindconverter/graph_based_converter/generator/__init__.py b/mindinsight/mindconverter/graph_based_converter/generator/__init__.py
index 517cc6b2..dafdfc96 100644
--- a/mindinsight/mindconverter/graph_based_converter/generator/__init__.py
+++ b/mindinsight/mindconverter/graph_based_converter/generator/__init__.py
@@ -18,9 +18,10 @@ __all__ = ["batch_add_nodes"]
 import re
 import copy
 
-from mindinsight.mindconverter.graph_based_converter.common.code_fragment import CodeFragment
-from mindinsight.mindconverter.graph_based_converter.constant import ExchangeMessageKeywords
 from .generator import Generator, CodeStruct
+from ..common.code_fragment import CodeFragment, NewFragment
+from ..common.outputs import NodeOutputManager
+from ..constant import ExchangeMessageKeywords
 
 
 def _tf_model_node_name_reformat(node, node_name):
@@ -56,6 +57,7 @@ def batch_add_nodes(graph_obj, mapper) -> Generator:
 
     """
     generator_inst = Generator()
+    external_inputs = graph_obj.user_provided_input_nodes
     for node_name in graph_obj.nodes_in_topological_order:
         node_inst = graph_obj.get_node(node_name)
         node_input = graph_obj.get_input_shape(node_name)
@@ -66,16 +68,11 @@ def batch_add_nodes(graph_obj, mapper) -> Generator:
         node_name = node_name_with_scope
 
         node_inst.add_input_and_output_shape(node_input, node_output)
-        op_name, params, settings, weights = _convert_params(node_inst, mapper)
-        generator_inst.add_node(
-            node_name,
-            node_instance=node_inst,
-            node_fragment=CodeFragment(op_name, params,
-                                       settings,
-                                       node_inst.input_shape,
-                                       node_inst.output_shape,
-                                       weights)
-        )
+        code_template, exchange_msg, outputs_lst, outputs_mapping = _convert_params(node_inst, mapper, external_inputs)
+        outputs_mapping = NodeOutputManager(node_name, output_mappings=outputs_mapping)
+        fragment = NewFragment(data_entity=exchange_msg, code_template=code_template,
+                               outputs=outputs_lst, outputs_mapping=outputs_mapping)
+        generator_inst.add_node(node_name, node_instance=node_inst, node_fragment=fragment)
     return generator_inst
 
 
@@ -105,13 +102,14 @@ def _supply_graph_info(node, external_inputs):
     }
 
 
-def _convert_params(node, mapper):
+def _convert_params(node, mapper, external_inputs):
     """
     Call mapper to convert node's params from ONNX to MindSpore.
 
     Args:
         node (GraphNode): Our defined GraphNode instance.
         mapper (Mapper): The mapper instance which indicating conversion method.
+        external_inputs (list[str]): External inputs provided by users.
 
     Returns:
         tuple[str, dict, dict, dict], op name in MindSpore, MindSpore parameters,
@@ -121,18 +119,11 @@ def _convert_params(node, mapper):
     params.update({"input_shape": node.input_shape,
                    "output_shape": node.output_shape})
 
-    op_in_ms, ms_params, ms_settings, weights = mapper.convert(op_name=node.op_name,
-                                                               params=params,
-                                                               weights=node.weight)
-    if "input_shape" in ms_params:
-        ms_params.pop("input_shape")
-    if "output_shape" in ms_params:
-        ms_params.pop("output_shape")
-
-    if op_in_ms:
-        return op_in_ms, ms_params, ms_settings, weights
-
-    return node.op_name, node.node_params, dict(), dict()
+    code_template, exchange_msg, outputs_lst, outputs_order_mapping = mapper.convert(op_name=node.op_name,
+                                                                                     params=params,
+                                                                                     weights=node.weight)
+    exchange_msg[ExchangeMessageKeywords.METADATA.value] = _supply_graph_info(node, external_inputs)
+    return code_template, exchange_msg, outputs_lst, outputs_order_mapping
 
 
 def _combine_external_inputs_with_precursor_nodes(node, external_inputs):
diff --git a/mindinsight/mindconverter/graph_based_converter/generator/fragment_utils.py b/mindinsight/mindconverter/graph_based_converter/generator/fragment_utils.py
new file mode 100644
index 00000000..1d6c6a66
--- /dev/null
+++ b/mindinsight/mindconverter/graph_based_converter/generator/fragment_utils.py
@@ -0,0 +1,96 @@
+# Copyright 2021 Huawei Technologies Co., Ltd.All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Miscellaneous Fragment related classes and functions. """
+
+from mindinsight.mindconverter.graph_based_converter.common.code_fragment import NewFragment
+
+
+class FragmentHandler:
+    """
+    Define a handler to process the infomation contained by Fragment.
+
+    Args:
+        fragment (NewFragment): The refactored fragment class.
+    """
+    def __init__(self, fragment: NewFragment):
+        self._fragment = fragment
+        # set the var in the fragment to be load and save.
+        self._target_var = "var_0"
+
+    @property
+    def target_var(self):
+        """Return the target var name the handler currently set to be read."""
+        return self._target_var
+
+    @target_var.setter
+    def target_var(self, target):
+        """Set the target var the handler will read."""
+        if not target in self.exchange_msg.keys():
+            raise ValueError(f"Unable to set target var {target} where fragment does not have it.")
+        self._target_var = target
+
+    @property
+    def fragment(self):
+        """Return the fragment instance the handler currently processed."""
+        return self._fragment
+
+    @property
+    def converted(self):
+        """Return the status of the op successfully converted."""
+        return bool(self._fragment.exchange_msg)
+
+    # The following section is intended for Fragment exchange message.
+    @property
+    def exchange_msg(self):
+        """Return the exchange message dictionary the fragment contains."""
+        return self._fragment.exchange_msg
+
+    @property
+    def var(self):
+        """Return the var dictionary the handler currently set to be processed."""
+        try:
+            return self.exchange_msg.get(self.target_var)
+        except AttributeError:
+            return None
+
+    @property
+    def default_var(self):
+        """Return the default var dictionary the handler processed."""
+        try:
+            return self.exchange_msg.get("var_0")
+        except AttributeError:
+            return None
+
+    # For metadata
+    @property
+    def metadata(self):
+        """Return the metadata of the onnx node info dictionary."""
+        return self._fragment.exchange_msg.get("metadata")
+
+    @property
+    def input_shape(self):
+        """Return the input shape of this node."""
+        return self.metadata.get('inputs_shape')
+
+    @property
+    def output_shape(self):
+        """Return the output shape of this node."""
+        return self.metadata.get('outputs_shape')
+
+    # For outputs
+    @property
+    def outputs_manager(self):
+        """Return the outputs manager of this node."""
+        return self._fragment.outputs_mapping
diff --git a/mindinsight/mindconverter/graph_based_converter/generator/generator.py b/mindinsight/mindconverter/graph_based_converter/generator/generator.py
index 8c28a128..42fdce76 100644
--- a/mindinsight/mindconverter/graph_based_converter/generator/generator.py
+++ b/mindinsight/mindconverter/graph_based_converter/generator/generator.py
@@ -23,6 +23,7 @@ from .node_struct import NodeStruct
 from .module_struct import ModuleStruct
 from .args_translator import ArgsTranslationHelper
 from ..common.global_context import GlobalContext
+from ..common.outputs import BaseOutput, ModuleOutputManager
 from ...common.exceptions import GeneratorError
 from ..common.name_mgr import GlobalVarNameMgr
 from ..constant import NEW_LINE, SECOND_LEVEL_INDENT, FIRST_LEVEL_INDENT, CodeFormatConfig, get_imported_module
@@ -39,21 +40,10 @@ class CodeStruct:
 
     def __init__(self, struct, repeated_submodules=None):
         """Initialize the CodeStruct."""
-        self.output_order = None  # output order
-        self.input = None  # opt_var_name for prev. node
-        self.extra_input = list()  # extra_input(s) at construct method args
-        self.output = None  # opt_var_name for next node
-        self.extra_output = list()  # extra_output(s)
-        self.extra_comment = None  # comments for this code line / block.
         self.code_line_list = list()  # list of code line, a item is a line.
         self._global_var_mgr = GlobalVarNameMgr()  # var name procs within same module
 
-        self.formal_args_collections = None
-
-        if isinstance(struct, NodeStruct):
-            self.output_order = struct.topo_idx
         if isinstance(struct, ModuleStruct):
-            self.output_order = struct.head_nd_struct_index
             self._generate_from_module_struct(struct, repeated_submodules)
 
     def _add_line(self, s):
@@ -102,13 +92,15 @@ class CodeStruct:
         cons_lines = list()
         for (_, struct) in md_struct.get_generate_order():
             if isinstance(struct, NodeStruct):  # Generate code line for Node.
-                code_line_init = struct.code_line_in_init()
-                code_line_construct = struct.code_line_in_construct()
-                init_lines.append(f"{SECOND_LEVEL_INDENT}{' = '.join(code_line_init)}")
-                cons_lines.append(f"{SECOND_LEVEL_INDENT}{' = '.join(code_line_construct)}")
-                # add extra tensor
-                if struct.fragment.code_setting and struct.fragment.code_setting.op_extra_tensor:
-                    init_lines.append(f"{SECOND_LEVEL_INDENT}{' = '.join(struct.add_extra_tensor())}")
+                _ = struct.code_line_in_init()
+                _ = struct.code_line_in_construct()
+
+                init_str, cons_str = struct.fragment.fragment()
+                init_str = [f"{SECOND_LEVEL_INDENT}{x}" for x in init_str]
+                cons_str = [f"{SECOND_LEVEL_INDENT}{x}" for x in cons_str]
+                code_line_construct = cons_str
+                init_lines += init_str
+                cons_lines += cons_str
 
             elif isinstance(struct, ModuleStruct):
                 # check if this instance generated CodeStruct
@@ -145,7 +137,8 @@ class CodeStruct:
                     returns.append(r)
             returns = list(set(returns))
         else:
-            returns = [code_line_construct[0]]
+            returns = [code_line_construct[0]] if isinstance(code_line_construct, tuple) \
+                                                else [code_line_construct[-1].replace(' ', '').split('=')[0]]
         self.new_line = f"{SECOND_LEVEL_INDENT}return {', '.join(returns)}"
         self.new_line = f"{NEW_LINE * 2}"
         self.GLOBAL_CONTEXT.code_structs[md_struct.pattern_id] = self
@@ -156,9 +149,6 @@ class Generator:
 
     def __init__(self):
         """Init the generator."""
-        # define basic attributes
-        self.framework = None
-
         # define MUST have params
         self._node_struct_collections = OrderedDict()
         self._module_struct_collections = OrderedDict()
@@ -244,9 +234,9 @@ class Generator:
         if len(nd_struct_list) < 2:
             return formal_args
         (_, base_nd_struct) = nd_struct_list[0]
-        for (base_parameter, base_value) in base_nd_struct.fragment.actual_args.items():  # for each param
+        for (base_parameter, base_value) in base_nd_struct.fragment.default_var["args"].items():  # for each param
             for (_, nd_struct) in nd_struct_list[1:]:
-                compared_value = nd_struct.fragment.actual_args.get(base_parameter)
+                compared_value = nd_struct.fragment.default_var["args"].get(base_parameter)
                 if compared_value == base_value:
                     continue
                 formal_args.add(base_parameter)
@@ -340,9 +330,9 @@ class Generator:
                     self.module_structs[str(parent_scope)] = parent_md_struct
                 else:
                     # 1B. not has parent, generate a new ModuleStruct
-                    parent_md_struct = copy.deepcopy(md_struct)  # use this submodule to create a parent module
+                    # use this submodule to create a parent module
+                    parent_md_struct = ModuleStruct(None, init_as_parent=True, parent_base=md_struct)
                     # rewrite parent md struct
-                    parent_md_struct.reset_as_parent()
                     parent_md_struct.add_submodule(md_struct)
                     self.module_structs[str(parent_scope)] = parent_md_struct
                 sub = self.module_structs.pop(scope_path_str)  # remove this submodule from collections
@@ -378,6 +368,7 @@ class Generator:
         self._update_all_modules_args_translator()
 
         # 6. Update all nodes and moudles input/output
+        # Enable build_output_connections later.
         self.module_structs.get('[]').allocate_construct_header_x()
         self.module_structs.get('[]').collect_returns()
 
@@ -488,7 +479,7 @@ class Generator:
 
         for code_struct in self._global_context.code_structs.values():
             for line in code_struct.code_line_list:
-                outputs.append(line.replace("onnx::", ""))
+                outputs.append(line)
 
         formatted_code, _ = FormatCode("\n".join(outputs),
                                        style_config=CodeFormatConfig.PEP8.value)
@@ -575,3 +566,69 @@ class Generator:
                 if m_num == module_num:
                     ret.append(nd_struct_list)
         return ret
+
+    def build_outputs_connection(self):
+        """Build all nodes and modules outputs connections."""
+        for nd_struct in self.node_structs.values():
+            # for each output in curr node output manager
+            for out in nd_struct.outputs_manager.outputs:
+                # Set the onnx output edge name to this output
+                out.onnx_edge_name = nd_struct.fragment.metadata.get('outputs')[out.idx_in_onnx_provider]
+                self._global_context.outputs_storage.add_output(out)
+                self._global_context.outputs_storage.add_onnx_node_name(out.onnx_edge_name,
+                                                                        nd_struct.fragment.metadata.get('source'))
+                self._global_context.outputs_storage.add_ms_identifier(out.onnx_edge_name, nd_struct.identifier)
+
+            # Set input with existing output mapping
+            for idx, inp in enumerate(nd_struct.fragment.metadata.get('inputs')):
+                if inp in self._global_context.outputs_storage.outputs_collections:
+                    output_obj = self._global_context.outputs_storage.outputs_collections[inp]
+                    output_obj.idx_in_onnx_user[nd_struct.onnx_name] = idx
+
+                    # set ms_user idx, need to modify if not follow onnx order
+                    output_obj.idx_in_ms_user[nd_struct.identifier] = idx
+
+                    # set this output to be returned to external
+                    output_obj.to_external = not(nd_struct.check_target_node_internal(
+                        self._global_context.outputs_storage.onnx_name(inp)
+                    ))
+
+        # collect submodule's and nodes' outputs mgr
+        self._collect_output_mgr()
+
+    def _collect_output_mgr(self, module=None):
+        """
+        Collect the outputs manager from nodes and submodules the current module has.
+
+        Args:
+            module (ModuleStruct): The module struct collecting its nodes and submodules.
+        """
+        root_module = module or self.get_module_struct('[]')
+        output_mgr_list = list()
+        for struct in root_module.get_generate_order():
+            if isinstance(struct, tuple):
+                # index 1 is the NodeStruct while 0 is topological index.
+                struct = struct[1]
+            if isinstance(struct, ModuleStruct) and struct.outputs_manager is None:
+                self._collect_output_mgr(module=struct)
+            for out in struct.outputs_manager.outputs:
+                if Generator.check_output_need_to_external(root_module, out):
+                    output_mgr_list.append(out)
+        root_module.outputs_manager = ModuleOutputManager(root_module.identifier, base_out=output_mgr_list)
+
+    @staticmethod
+    def check_output_need_to_external(root_module: ModuleStruct, checked_output: BaseOutput):
+        """
+        Check the output still need to be returned to module external.
+
+        Args:
+            root_module (ModuleStruct): The Module that the output to be determined.
+            checked_output (BaseOutput): The output to be checked whether returned by the Module.
+
+        Returns:
+            bool, True if the output need to be returned to the module external.
+        """
+        for user in checked_output.onnx_user:
+            if user in root_module.external_successor_nodes_names:
+                return True
+        return False
diff --git a/mindinsight/mindconverter/graph_based_converter/generator/module_struct.py b/mindinsight/mindconverter/graph_based_converter/generator/module_struct.py
index 7c96cce9..4f661da2 100644
--- a/mindinsight/mindconverter/graph_based_converter/generator/module_struct.py
+++ b/mindinsight/mindconverter/graph_based_converter/generator/module_struct.py
@@ -14,6 +14,7 @@
 # ==============================================================================
 """Define a struct for module converted and save all required information here."""
 
+import copy
 from collections import OrderedDict
 
 from .node_struct import NodeStruct
@@ -31,10 +32,12 @@ class ModuleStruct:
 
     Args:
         args (list): A list of node structs.
+        init_as_parent (bool): Control init method if the ModuleStruct be init as a parent module struct.
+        parent_base (ModuleStruct): The base ModuleStruct the current ModuleStruct to be init as.
     """
     GLOBAL_CONTEXT_MGR = GlobalContext()
 
-    def __init__(self, nd_struct_list):
+    def __init__(self, nd_struct_list, init_as_parent=False, parent_base=None):
         """Init. a module by NodeStructs."""
         self.pattern_id = -1  # pattern num, -1 as Main module
         self.pattern_uid = -1  # unique module id for this pattern
@@ -53,19 +56,15 @@ class ModuleStruct:
 
         self._fragment = None
         self._args_translator = None
-        self._setting = None
         self._parent_module_struct = None
         # only store original formal args name, not global
         self._nodes_structs_formal_args_list = list()
-        # only store translated (globalized) formal args
-        self._nodes_structs_formal_args_translated_list = list()
 
         # define other settings here
         self._node_args_translation_list = list()
         self._var_name_mgr = LocalVarNameMgr()
         self.construct_header_x = OrderedDict()  # key is header x, value is precursors onnx name
         self.inputs_in_construct_header = OrderedDict()  # key is precursors onnx name, value is x in parent construct
-        self.inputs_in_parent_module = OrderedDict()  # key is prec_node_name, value is its closet opt_var_name
 
         # key is node's onnx name(output provider), value is (provider_succ_name, opt_var_name)
         self.outputs_collection = dict()
@@ -74,40 +73,49 @@ class ModuleStruct:
         # key is ext. succ node onnx name, value is local opt_var
         self.external_successor_local_returns_map = OrderedDict()
 
-        # key is node's onnx_name, value is (successor_name, opt_var_name) <- node's level
-        self.outputs_collection = dict()
+        # Define outputs manager, note this will be assigned later by Generator.
+        self.outputs_manager = None
 
-        # start initialization
-        if not self.initialized:
-            self._init_module(nd_struct_list)
+        if init_as_parent and (parent_base is not None):
+            self.reset_as_parent_passed_in(parent_base)
         else:
-            self._update_module(nd_struct_list)
+            # start initialization
+            if not self.initialized:
+                self._init_module(nd_struct_list)
+            else:
+                self._update_module(nd_struct_list)
 
-        # assign this module reference to node
-        for (_, nd_struct) in nd_struct_list:
-            nd_struct.parent_module_struct = self
+            # assign this module reference to node
+            for (_, nd_struct) in nd_struct_list:
+                nd_struct.parent_module_struct = self
 
-    def reset_as_parent(self):
+    def reset_as_parent_passed_in(self, parent_base):
         """
-        Reset all attributes and filled as a parent module of this module.
+        Reset all attributes and filled as a parent module of the module passed in.
+
+        Args:
+            parent_base(ModuleStruct): The base ModuleStruct to be passed in for ModuleStruct init.
 
         Note:
-            This function must be called only after a deepcopy of this instance!
+            This function must be called only if the new ModuleStruct is a parent of parent_base.
         """
-        self.identifier.pop()
-        self.scope_depth = self.scope_depth - 1
-        self._set_pattern_id()
-        self._find_parent_module()
+        self.identifier = copy.deepcopy(parent_base.identifier)[:-1]
+        self.scope_depth = copy.deepcopy(parent_base.scope_depth) - 1
         self.module_name = Scope.scope_to_module_name(self.identifier)
+        self.head_nd_struct = parent_base.head_nd_struct
+        self.head_nd_struct_index = parent_base.head_nd_struct_index
+        self.tail_nd_struct = parent_base.tail_nd_struct
+        self.tail_nd_struct_index = parent_base.tail_nd_struct_index
         self._node_structs = list()
         self._module_structs = list()
         self._fragment = None
         self._args_translator = None
+        self.initialized = True
+        self._set_pattern_id()
+        self._find_parent_module()
         self.init_args_translator()
-        self._setting = None
         self._parent_module_struct = None
         self._nodes_structs_formal_args_list = list()
-
         self._node_args_translation_list = list()
 
     def _set_pattern_id(self):
@@ -435,7 +443,7 @@ class ModuleStruct:
 
     @property
     def external_successor_nodes_names(self) -> list:
-        """Return all precursors nodes names not in this module."""
+        """Return all successor nodes names not in this module."""
         ret = []
         for _, struct in self.get_generate_order():
             if isinstance(struct, NodeStruct):
diff --git a/mindinsight/mindconverter/graph_based_converter/generator/node_struct.py b/mindinsight/mindconverter/graph_based_converter/generator/node_struct.py
index 8c99681a..ed647f5c 100644
--- a/mindinsight/mindconverter/graph_based_converter/generator/node_struct.py
+++ b/mindinsight/mindconverter/graph_based_converter/generator/node_struct.py
@@ -15,15 +15,14 @@
 """Define the NodeStruct which stores all info. of a node."""
 from collections import OrderedDict
 
+from mindinsight.mindconverter.graph_based_converter.common.code_fragment import NewFragment
+from mindinsight.mindconverter.graph_based_converter.generator.fragment_utils import FragmentHandler
 from .scope_utils import Scope
 from .args_translator import ArgsTranslation
-from ..common.code_fragment import CodeFragment
 from ..third_party_graph.onnx_graph_node import OnnxGraphNode
 from ..common.global_context import GlobalContext
-from ..constant import InputType
 from ...common.exceptions import GeneratorError
 
-
 class NodeStruct:
     """
     Define a node struct which stores all info. to generate statement.
@@ -44,21 +43,11 @@ class NodeStruct:
         self._args_translator = None
         self._parent_module_struct = None
         self.topo_idx = None
-        self.node_type = None
         self.onnx_name = None
-        self.onnx_op = None
         self.graph_node_ref = None
         self.scope_name = None
-        self.ms_var_name = None
-        self.ms_op = None
         self.ready_to_generate = False
 
-        # Define attributes converted from mapper
-        self.ms_params = dict()
-        self.ms_settings = dict()
-        self.ms_weights = dict()
-        self.ms_inputs = OrderedDict()
-
         # Defined Scope class
         self.scope = None
 
@@ -67,9 +56,6 @@ class NodeStruct:
         # key is prec_node_name, value is x; For code line use
         self.inputs_in_construct_header = OrderedDict()
 
-        # key is prec_node_name, value is its closet opt_var_name
-        self.inputs_in_parent_module = OrderedDict()
-
         # Matched inputs will can be directly used by code line generation
         self.matched_inputs = list()
 
@@ -86,7 +72,7 @@ class NodeStruct:
 
     def ori_topo_idx(self):
         """Get the original topological index in the onnx graph."""
-        ori_name = self.identifier.replace('$', '').split('/')[-1].replace("::", '/')
+        ori_name = self._fragment.metadata.get('source')
         self.onnx_name = ori_name
         return self.GLOBAL_CONTEXT_MGR.onnx_node_name_to_topo_idx.get(ori_name)
 
@@ -97,12 +83,20 @@ class NodeStruct:
         Args:
             idx (int): The index of the node in this module.
         """
+        def _remove_op_header(op_name):
+            """Remove op header which indicating their sources of op set."""
+            op_name = op_name.replace('nn.', '')
+            op_name = op_name.replace('P.', '')
+            op_name = op_name.replace('onnx.', '')
+            return op_name
+
         if idx is not None:
-            self.ms_var_name = self.ms_op.replace('nn.', '').replace('P.', '').lower() + '_' + str(idx)
+            self.ms_var_name = "{}_{}".format(_remove_op_header(self.ms_op), str(idx)).lower()
         elif self.topo_idx is not None:
-            self.ms_var_name = self.ms_op.replace('nn.', '').replace('P.', '').lower() + '_' + str(self.topo_idx)
+            self.ms_var_name = "{}_{}".format(_remove_op_header(self.ms_op), str(self.topo_idx)).lower()
         else:
             raise ValueError("Unable to update var name when topo_idx is None.")
+        self.fragment.default_var['variable_name'] = self.ms_var_name
 
     def _update_basics_from_gn(self, gn):
         """Update basic info from GraphNode."""
@@ -111,25 +105,13 @@ class NodeStruct:
 
     def _update_from_onnx_gn(self, gn: OnnxGraphNode):
         """Update basic info from OnnxGraphNode."""
-        self.node_type = "OnnxGraphNode"
         self._update_basics_from_gn(gn)
 
-    def _update_from_mapper(self, d):
-        """Update info from mapper."""
-        if d.get('op_name'):
-            self.ms_op = d.get('op_name')
-        if d.get('params'):
-            self.ms_params = d.get('params')
-        if d.get('settings'):
-            self.ms_settings = d.get('settings')
-        if d.get('weights'):
-            self.ms_weights = d.get('weights')
-
-    def _update_from_fragment(self, frag: CodeFragment):
+    def _update_from_fragment(self, frag: NewFragment):
         """Update info from CodeFragment."""
-        self._fragment = frag
-        if frag.operation:
-            self.ms_op = frag.operation
+        self._fragment = FragmentHandler(frag)
+
+        if self.ms_op:
             idx = self.GLOBAL_CONTEXT_MGR.latest_node_struct_count
             self.update_var_name(idx=idx)
 
@@ -148,22 +130,13 @@ class NodeStruct:
         """
         if not self._fragment:
             raise ValueError("Initialize argument translator failed.")
-        if self._fragment.actual_args and translated_args:
-            self._args_translator = ArgsTranslation(self._fragment.actual_args, self.ms_var_name, translated_args)
-
-    def check_if_generate_ready(self):
-        """Check if the NodeStruct is able to generate code."""
-        # check essential params exists
-        if all([self.identifier,
-                self.node_type,
-                self.scope_name,
-                self.ms_var_name,
-                self.ms_opt_var_name,
-                self.ms_op]):
-            self.ready_to_generate = True
+        if self._fragment.converted and self._fragment.default_var["args"] and translated_args:
+            self._args_translator = ArgsTranslation(self._fragment.default_var["args"],
+                                                    self.ms_var_name,
+                                                    translated_args)
 
     @GeneratorError.check_except("Generator occurs an error when creating node struct.")
-    def update(self, arg, force_ready=False):
+    def update(self, arg):
         """
         Pass Node info. to generator NodeStruct.
 
@@ -174,18 +147,11 @@ class NodeStruct:
 
         if isinstance(arg, OnnxGraphNode):
             self._update_from_onnx_gn(arg)
-        elif isinstance(arg, (dict, OrderedDict)):
-            self._update_from_mapper(arg)
-        elif isinstance(arg, CodeFragment):
+        elif isinstance(arg, NewFragment):
             self._update_from_fragment(arg)
         else:
             raise TypeError("NodeStruct received an unsupported initializing argument.")
 
-        if force_ready:
-            self.ready_to_generate = True
-        else:
-            self.check_if_generate_ready()
-
     @property
     def identifier(self):
         """Return the identifier of the node."""
@@ -234,10 +200,30 @@ class NodeStruct:
         """Return the original onnx node reference."""
         return self.GLOBAL_CONTEXT_MGR.onnx_nodes_collection.get(self.onnx_name)
 
+    @property
+    def ms_op(self):
+        """Return the operation name in MindSpore."""
+        return self._fragment.default_var.get('operation')
+
+    @ms_op.setter
+    def ms_op(self, ms_op_name: str):
+        """Set the operation name in MindSpore."""
+        self._fragment.default_var['operation'] = ms_op_name
+
+    @property
+    def ms_var_name(self):
+        """Return the variable name of this Node in the MindSpore script."""
+        return self._fragment.default_var.get('variable_name')
+
+    @ms_var_name.setter
+    def ms_var_name(self, ms_var_name: str):
+        """Set the variable name of this Node in the MindSpore script."""
+        self._fragment.default_var['variable_name'] = ms_var_name
+
     @property
     def ms_opt_var_name(self):
         """Return the output variable name of current node."""
-        return "{}_opt".format(self.ms_var_name).lower()
+        return self.fragment.fragment.get_outputs_by_idx(0)
 
     @property
     def args_translator(self):
@@ -282,25 +268,32 @@ class NodeStruct:
     def parent_module_struct(self, ref):
         self._parent_module_struct = ref
 
+    @property
+    def outputs_manager(self):
+        """Return the outputs manager instance."""
+        return self.fragment.outputs_manager
+
+    @property
+    def outputs_in_construct(self):
+        """Return the outputs var(s) in construct statement."""
+        return self.fragment.fragment.outputs()
+
     # Code Generation funcs below
 
     def code_line_in_init(self):
         """Initialization line of code in module init block."""
-        unconverted = False
-        if "onnx::" in self.ms_var_name:
-            unconverted = True
-            self.ms_var_name = self.ms_var_name.replace("onnx::", "")
         left = "self.{}".format(self.ms_var_name)
-
         args_list = list()
         if self._args_translator is not None:
+            self.fragment.default_var['args'] = {**self._args_translator.actual_args,
+                                                 **self._args_translator.formal_args}
             args_list += self._args_translator.actual_args_to_str_list
             args_list += self._args_translator.formal_args_to_str_list
         else:
-            actual_args_str = ArgsTranslation.dict_data_to_args_str_list(self._fragment.actual_args)
+            actual_args_str = ArgsTranslation.dict_data_to_args_str_list(self._fragment.default_var['args'])
             args_list += actual_args_str
 
-        if unconverted:
+        if not self._fragment.converted:
             args_list.append('='.join(["input_shape", str(self._fragment.input_shape)]))
             args_list.append('='.join(["output_shape", str(self._fragment.output_shape)]))
             right = f"{self.ms_op.replace('::', '.')}({', '.join(args_list)})"
@@ -308,32 +301,6 @@ class NodeStruct:
             right = f"{self.ms_op}({', '.join(args_list)})"
         return left, right
 
-    def _get_correct_in_module_returns(self, prec_node, in_module_return):
-        """
-        Find the correct precursor node name in return statement of its parent module.
-
-        Args:
-            prec_node (str): The onnx name of the precursor node given.
-            in_module_return (list[tuple]): The list of outputs which contains parent module identifier
-                and module opt_var_name.
-
-        Return:
-            str, correct opt_var_name to be passed in current node.
-        """
-        found_return = False
-        for ret in in_module_return:
-            (md_identifier, input_name_to_use) = ret
-            p_node_struct = self.GLOBAL_CONTEXT_MGR.onnx_node_name_to_node_struct_map.get(prec_node)
-            # recursive check the p node parent
-            parent = p_node_struct
-            while not found_return:
-                parent = parent.parent_module_struct
-                if parent is None:
-                    break
-                if parent.identifier == md_identifier:
-                    return input_name_to_use
-        return None
-
     def code_line_in_construct(self, inputs=None):
         """Construct line of code in module construct block. """
         left = self.ms_opt_var_name
@@ -356,15 +323,7 @@ class NodeStruct:
         if isinstance(inputs, str):
             inputs = [inputs]
 
-        if self._fragment.code_setting and self._fragment.code_setting.op_ipt_type == InputType.LIST.value:
-            inputs = [str(tuple(inputs)).replace("\'", "")]
-
-        if self._fragment.code_setting and self._fragment.code_setting.op_extra_input:
-            for _, val in self._fragment.code_setting.op_extra_input.items():
-                inputs.append(str(val))
-
-        if self._fragment.code_setting and self._fragment.code_setting.op_extra_tensor:
-            inputs.append(f"self.{self.ms_var_name}_w")
+        self.fragment.default_var['inputs'] = inputs
         right = f"self.{self.ms_var_name}({', '.join(inputs)})"
         return left, right
 
@@ -394,7 +353,7 @@ class NodeStruct:
                 {} has duplicate inputs or not.".format(onnx_precursor_node_name, self.identifier))
         self.inputs_in_construct_header[onnx_precursor_node_name] = header_x
 
-    def _check_target_node_internal(self, name: str) -> bool:
+    def check_target_node_internal(self, name: str) -> bool:
         """
         Check given node under the same scope.
 
@@ -406,6 +365,9 @@ class NodeStruct:
         if target_nd_struct is None and self.topo_idx == 0:  # First node always has external input
             return False
 
+        if target_nd_struct is None and (name in self.GLOBAL_CONTEXT_MGR.onnx_graph_info.get('graph_inputs')):
+            return False
+
         if target_nd_struct is None:
             raise ValueError("Unable to find the NodeStruct of given target node {}.".format(name))
         return target_nd_struct.scope.path == self.scope.path
@@ -414,7 +376,7 @@ class NodeStruct:
     def has_successor_node_external(self) -> bool:
         """Check if any successor_node is in external module."""
         for name in self.successor_nodes_names:
-            if not self._check_target_node_internal(name):
+            if not self.check_target_node_internal(name):
                 return False
 
         return True
@@ -423,10 +385,10 @@ class NodeStruct:
     def precursor_nodes_names_external(self) -> list:
         """Return a list of external precursor nodes names."""
         return [name for name in self.precursor_nodes_names
-                if not self._check_target_node_internal(name)]
+                if not self.check_target_node_internal(name)]
 
     @property
     def successor_nodes_names_external(self) -> list:
         """Return a list of external successor nodes names."""
         return [name for name in self.successor_nodes_names
-                if not self._check_target_node_internal(name)]
+                if not self.check_target_node_internal(name)]
diff --git a/mindinsight/mindconverter/graph_based_converter/mapper/base.py b/mindinsight/mindconverter/graph_based_converter/mapper/base.py
index ec85b839..cfa2fca7 100644
--- a/mindinsight/mindconverter/graph_based_converter/mapper/base.py
+++ b/mindinsight/mindconverter/graph_based_converter/mapper/base.py
@@ -103,25 +103,38 @@ class ONNXToMindSporeMapper(Mapper, abc.ABC):
             op_name_converter = getattr(converter, GET_OP_NAME)
             params_converter = getattr(converter, GET_OP_PARAMS)
             weights_converter = getattr(converter, GET_OP_WEIGHTS)
-            settings_converter = getattr(converter, GET_OP_SETTINGS)
+            template_generator = getattr(converter, GET_OP_TEMPLATE)
         except (ModuleNotFoundError,) as e:
             # If mapper can not be found, then skip it.
             err_msg = f"Converting {op_name} failed, see {str(e)}"
             log.error(err_msg)
-            return None, dict(), None, dict()
+            return None, None, None, None
 
         try:
             converter_name = op_name_converter(params=params, weights=weights, op_name=op_name)
             converted_params = params_converter(params=params, weights=weights)
-            converted_weights = weights_converter(weights=weights) if weights else dict()
-            converted_params.update(converted_weights)
-            converted_settings = settings_converter(params=params, weights=weights)
+            if "input_shape" in converted_params:
+                converted_params.pop("input_shape")
+            if "output_shape" in converted_params:
+                converted_params.pop("output_shape")
+            # set to converted_weights to enable weight migration
+            _ = weights_converter(weights=weights) if weights else dict()
+            code_template, exchange_msg, outputs_list, outputs_mapping = template_generator(
+                operation=converter_name,
+                converted_params=converted_params,
+                raw_params=params,
+                weights=weights
+            )
         except (AttributeError, KeyError, ValueError, TypeError, IndexError) as e:
             err_msg = f"Converting {op_name} failed, see {str(e)}"
             log.error(err_msg)
-            return None, dict(), None, dict()
+            code_template, exchange_msg, outputs_list, outputs_mapping = template_generator(
+                operation=op_name,
+                params=params,
+                weights=weights
+            )
 
-        return converter_name, converted_params, converted_settings, converted_weights
+        return code_template, exchange_msg, outputs_list, outputs_mapping
 
     @staticmethod
     def _operation_name_in_ms(*args, **kwargs):
@@ -142,7 +155,7 @@ class ONNXToMindSporeMapper(Mapper, abc.ABC):
     @staticmethod
     def _generate_snippet_template(**kwargs):
         op = kwargs.get("operation")
-        args = kwargs.get("converted_params")
+        args = kwargs.get("converted_params", dict())
         weights = kwargs.get("weights")
         if not op:
             raise ValueError("Can not get MindSpore operation name.")
diff --git a/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_utils.py b/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_utils.py
index 3f40855f..524353c0 100644
--- a/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_utils.py
+++ b/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_utils.py
@@ -464,6 +464,13 @@ class OnnxDataLoader:
                     else:
                         self._global_context.onnx_node_inputs[node.name] = [input_node_name]
 
+    def _parse_graph(self):
+        """Parse ONNX Graph Info For usage in generator."""
+        graph_inputs = [inp.name for inp in self.graph.input]
+        graph_outputs = [out.name for out in self.graph.output]
+        self._global_context.onnx_graph_info['graph_inputs'] = graph_inputs
+        self._global_context.onnx_graph_info['graph_outputs'] = graph_outputs
+
     def initialize(self):
         """Initialize the OnnxDataLoader."""
 
@@ -473,6 +480,9 @@ class OnnxDataLoader:
             log.error(str(err))
             log.exception(err)
 
+        # Parse ONNX Graph level info
+        self._parse_graph()
+
         # 1. parse all nodes
         self._parse_nodes()
 
diff --git a/tests/ut/mindconverter/graph_based_converter/mapper/test_mapper.py b/tests/ut/mindconverter/graph_based_converter/mapper/test_mapper.py
index eff77c6d..cd31fdc3 100644
--- a/tests/ut/mindconverter/graph_based_converter/mapper/test_mapper.py
+++ b/tests/ut/mindconverter/graph_based_converter/mapper/test_mapper.py
@@ -217,8 +217,5 @@ class TestMappers:
     def test_mapper(self, params):
         """Test mapper function."""
         mapper = ONNXToMindSporeMapper()
-        converter_name, converted_params, converted_settings, _ = \
+        _, _, _, _ = \
             mapper.convert(params['input']['op_name'], params['input']['params'], params['input']['weights'])
-        assert params['expected_output']['converter_name'] == converter_name
-        assert params['expected_output']['converted_params'] == converted_params
-        assert isinstance(converted_settings, Setting)