diff --git a/python/examples/ocr/README_CN.md b/python/examples/ocr/README_CN.md
index ad7ddcee21dd2f514d2ab8f63a732ee93349abac..7e02109252c37bb972b36214713a65dd334524dd 100755
--- a/python/examples/ocr/README_CN.md
+++ b/python/examples/ocr/README_CN.md
@@ -25,7 +25,7 @@ tar xf test_imgs.tar
 python -m paddle_serving_server.serve --model ocr_det_model --port 9293
 python ocr_web_server.py cpu
 #for gpu user
-python -m paddle_serving_server.serve --model ocr_det_model --port 9293 --gpu_id 0
+python -m paddle_serving_server.serve --model ocr_det_model --port 9293 --gpu_ids 0
 python ocr_web_server.py gpu
 ```
 
@@ -110,7 +110,7 @@ python rec_web_client.py
 #for cpu user
 python -m paddle_serving_server.serve --model ocr_det_model ocr_rec_model --port 9293
 #for gpu user
-python -m paddle_serving_server.serve --model ocr_det_model ocr_rec_model --port 9293 --gpu_id 0
+python -m paddle_serving_server.serve --model ocr_det_model ocr_rec_model --port 9293 --gpu_ids 0
 ```
 
 ### 启动客户端