diff --git a/doc/BERT_10_MINS_CN.md b/doc/BERT_10_MINS_CN.md
index 0b92247332d0e2d43f8ab7fdf89ad90cb77b64cb..17592000f016f1f1e939e8f3dc6dab6e05f35fe7 100644
--- a/doc/BERT_10_MINS_CN.md
+++ b/doc/BERT_10_MINS_CN.md
@@ -50,7 +50,6 @@ pip install paddle_serving_app
 客户端脚本 bert_client.py内容如下
 
 ``` python
-import os
 import sys
 from paddle_serving_client import Client
 from paddle_serving_app import ChineseBertReader