diff --git a/python/paddle/dataset/wmt16.py b/python/paddle/dataset/wmt16.py
index 9c02e0f41b04e113251e0fda72ca8abd976ab6f7..39c6e78b9b431d0747118977eca3e9b476488344 100644
--- a/python/paddle/dataset/wmt16.py
+++ b/python/paddle/dataset/wmt16.py
@@ -78,7 +78,7 @@ def __build_dict(tar_file, dict_size, save_path, lang):
                     six.iteritems(word_dict), key=lambda x: x[1],
                     reverse=True)):
             if idx + 3 == dict_size: break
-            fout.write("%s\n" % (word[0]))
+            fout.write("%s\n" % (cpt.to_text(word[0])))
 
 
 def __load_dict(tar_file, dict_size, lang, reverse=False):