diff --git a/fastNLP/modules/prototype/example.py b/fastNLP/modules/prototype/example.py
index 782937fe..a19898c6 100644
--- a/fastNLP/modules/prototype/example.py
+++ b/fastNLP/modules/prototype/example.py
@@ -60,7 +60,7 @@ def train(model_dict=None, using_cuda=True, learning_rate=0.06,\
 
     optimizer = optim.SGD(net.parameters(), lr=learning_rate, momentum=momentum)
     criterion = nn.CrossEntropyLoss()
-    dataset = dataloader.DataLoader("test_set.pkl", batch_size, using_cuda=using_cuda)
+    dataset = dataloader.DataLoader("train_set.pkl", batch_size, using_cuda=using_cuda)
 
     #statistics
     loss_count = 0