diff --git a/fastNLP/core/dataloaders/torch_dataloader/fdl.py b/fastNLP/core/dataloaders/torch_dataloader/fdl.py
index d56dbac9..7f0d1bb6 100644
--- a/fastNLP/core/dataloaders/torch_dataloader/fdl.py
+++ b/fastNLP/core/dataloaders/torch_dataloader/fdl.py
@@ -98,6 +98,7 @@ class TorchDataLoader(DataLoader):
     def __getattr__(self, item):
         """
         为FDataLoader提供dataset的方法和属性，实现该方法后，用户可以在FDataLoader实例化后使用apply等dataset的方法
+
         :param item:
         :return:
         """
@@ -119,6 +120,7 @@ class TorchDataLoader(DataLoader):
         """
         设置每个field_name的padding值，默认为0，只有当autocollate存在时该方法有效， 若没有则会添加auto_collator函数
         当val=None时，意味着给定的field_names都不需要尝试padding
+
         :param field_names:
         :param val: padding值，默认为0
         :return:
diff --git a/tests/core/dataloaders/torch_dataloader/test_fdl.py b/tests/core/dataloaders/torch_dataloader/test_fdl.py
index baa3781a..7c1352aa 100644
--- a/tests/core/dataloaders/torch_dataloader/test_fdl.py
+++ b/tests/core/dataloaders/torch_dataloader/test_fdl.py
@@ -21,11 +21,12 @@ class TestFdl:
         ds.set_pad_val("x", val=-1)
         fdl = TorchDataLoader(ds, batch_size=3)
         fdl.set_input("x", "y")
+        fdl.set_pad_val("x", val=None)
         for batch in fdl:
             print(batch)
-        fdl.set_pad_val("x", val=-2)
-        for batch in fdl:
-            print(batch)
+        # fdl.set_pad_val("x", val=-2)
+        # for batch in fdl:
+        #     print(batch)
 
     def test_add_collator(self):
         ds = DataSet({"x": [[1, 2], [2, 3, 4], [4, 5, 6, 7]] * 10, "y": [1, 0, 1] * 10})
@@ -38,6 +39,7 @@ class TestFdl:
 
         fdl = TorchDataLoader(ds, batch_size=3, as_numpy=True)
         fdl.set_input("x", "y")
+        # fdl.set_pad_val("x", val=None)
         fdl.add_collator(collate_fn)
         for batch in fdl:
             print(batch)