diff --git a/tests/modules/torch/encoder/test_seq2seq_encoder.py b/tests/modules/torch/encoder/test_seq2seq_encoder.py
index 97aa5a7c..3570fd16 100755
--- a/tests/modules/torch/encoder/test_seq2seq_encoder.py
+++ b/tests/modules/torch/encoder/test_seq2seq_encoder.py
@@ -1,12 +1,12 @@
 import pytest
 
 from fastNLP.envs.imports import _NEED_IMPORT_TORCH
+from fastNLP import Vocabulary
 
 if _NEED_IMPORT_TORCH:
     import torch
 
     from fastNLP.modules.torch.encoder.seq2seq_encoder import TransformerSeq2SeqEncoder, LSTMSeq2SeqEncoder
-    from fastNLP import Vocabulary
     from fastNLP.embeddings.torch import StaticEmbedding
 
 
@@ -22,6 +22,7 @@ class TestTransformerSeq2SeqEncoder:
         assert (encoder_output.size() == (1, 3, 10))
 
 
+@pytest.mark.torch
 class TestBiLSTMEncoder:
     def test_case(self):
         vocab = Vocabulary().add_word_lst("This is a test .".split())