diff --git a/.travis.yml b/.travis.yml
index 0ba0af5a..85bac41e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 language: python
 python:
   - "3.6"
+
+env:
+  - TRAVIS=1
+
 # command to install dependencies
 install:
   - pip install --quiet -r requirements.txt
diff --git a/fastNLP/embeddings/static_embedding.py b/fastNLP/embeddings/static_embedding.py
index cdea7cfb..5f0e8eb0 100644
--- a/fastNLP/embeddings/static_embedding.py
+++ b/fastNLP/embeddings/static_embedding.py
@@ -280,6 +280,8 @@ class StaticEmbedding(TokenEmbedding):
                         found_unknown = True
                     if word in vocab:
                         index = vocab.to_index(word)
+                        if index in matrix:
+                            warnings.warn(f"Word:{word} occurs again in line:{idx}(starts from 0)")
                         matrix[index] = torch.from_numpy(np.fromstring(' '.join(nums), sep=' ', dtype=dtype, count=dim))
                         if self.only_norm_found_vector:
                             matrix[index] = matrix[index] / np.linalg.norm(matrix[index])