diff --git a/fastNLP/io/data_loader/matching.py b/fastNLP/io/data_loader/matching.py
index 21dcefb0..cecaee96 100644
--- a/fastNLP/io/data_loader/matching.py
+++ b/fastNLP/io/data_loader/matching.py
@@ -1,6 +1,6 @@
 import os
 
-from typing import Union, Dict , List
+from typing import Union, Dict, List
 
 from ...core.const import Const
 from ...core.vocabulary import Vocabulary
@@ -34,7 +34,7 @@ class MatchingLoader(DataSetLoader):
                 cut_text: int = None, get_index=True, auto_pad_length: int=None,
                 auto_pad_token: str='<pad>', set_input: Union[list, str, bool]=True,
                 set_target: Union[list, str, bool]=True, concat: Union[str, list, bool]=None,
-                extra_split: List[str]=List['-'], ) -> DataBundle:
+                extra_split: List[str]=None, ) -> DataBundle:
         """
         :param paths: str或者Dict[str, str]。如果是str，则为数据集所在的文件夹或者是全路径文件名：如果是文件夹，
             则会从self.paths里面找对应的数据集名称与文件名。如果是Dict，则为数据集名称（如train、dev、test）和
@@ -91,22 +91,22 @@ class MatchingLoader(DataSetLoader):
                 if Const.TARGET in data_set.get_field_names():
                     data_set.set_target(Const.TARGET)
 
-        if extra_split:
+        if extra_split is not None:
             for data_name, data_set in data_info.datasets.items():
                 data_set.apply(lambda x: ' '.join(x[Const.INPUTS(0)]), new_field_name=Const.INPUTS(0))
                 data_set.apply(lambda x: ' '.join(x[Const.INPUTS(1)]), new_field_name=Const.INPUTS(1))
 
                 for s in extra_split:
-                    data_set.apply(lambda x: x[Const.INPUTS(0)].replace(s , ' ' + s + ' '), 
-                                    new_field_name=Const.INPUTS(0))
-                    data_set.apply(lambda x: x[Const.INPUTS(0)].replace(s , ' ' + s + ' '), 
-                                    new_field_name=Const.INPUTS(0))
-
-                _filt = lambda x : x
-                data_set.apply(lambda x: list(filter(_filt , x[Const.INPUTS(0)].split(' '))), 
-                                    new_field_name=Const.INPUTS(0), is_input=auto_set_input)
-                data_set.apply(lambda x: list(filter(_filt , x[Const.INPUTS(1)].split(' '))), 
-                                    new_field_name=Const.INPUTS(1), is_input=auto_set_input)
+                    data_set.apply(lambda x: x[Const.INPUTS(0)].replace(s, ' ' + s + ' '),
+                                   new_field_name=Const.INPUTS(0))
+                    data_set.apply(lambda x: x[Const.INPUTS(0)].replace(s, ' ' + s + ' '),
+                                   new_field_name=Const.INPUTS(0))
+
+                _filt = lambda x: x
+                data_set.apply(lambda x: list(filter(_filt, x[Const.INPUTS(0)].split(' '))),
+                               new_field_name=Const.INPUTS(0), is_input=auto_set_input)
+                data_set.apply(lambda x: list(filter(_filt, x[Const.INPUTS(1)].split(' '))),
+                               new_field_name=Const.INPUTS(1), is_input=auto_set_input)
                 _filt = None
 
         if to_lower:
diff --git a/reproduction/matching/matching_mwan.py b/reproduction/matching/matching_mwan.py
index d2d3033f..e96ee0c9 100644
--- a/reproduction/matching/matching_mwan.py
+++ b/reproduction/matching/matching_mwan.py
@@ -18,7 +18,7 @@ from fastNLP.core.callback import GradientClipCallback, LRScheduler, FitlogCallb
 from fastNLP.modules.encoder.embedding import ElmoEmbedding, StaticEmbedding
 
 from fastNLP.io.data_loader import MNLILoader, QNLILoader, QuoraLoader, SNLILoader, RTELoader
-from model.mwan import MwanModel
+from reproduction.matching.model.mwan import MwanModel
 
 import fitlog
 fitlog.debug()
diff --git a/test/io/test_dataset_loader.py b/test/io/test_dataset_loader.py
index 3e3c54e2..9f0579a1 100644
--- a/test/io/test_dataset_loader.py
+++ b/test/io/test_dataset_loader.py
@@ -64,7 +64,13 @@ class TestDatasetLoader(unittest.TestCase):
     def test_import(self):
         import fastNLP
         from fastNLP.io import SNLILoader
-        ds = SNLILoader().process('test/data_for_tests/sample_snli.jsonl', to_lower=True,
+        ds = SNLILoader().process('./../data_for_tests/sample_snli.jsonl', to_lower=True,
+                                  get_index=True, seq_len_type='seq_len', extra_split=['-'])
+        assert 'train' in ds.datasets
+        assert len(ds.datasets) == 1
+        assert len(ds.datasets['train']) == 3
+
+        ds = SNLILoader().process('./../data_for_tests/sample_snli.jsonl', to_lower=True,
                                   get_index=True, seq_len_type='seq_len')
         assert 'train' in ds.datasets
         assert len(ds.datasets) == 1