diff --git a/python/examples/encryption/README_CN.md b/python/examples/encryption/README_CN.md
index f950796ec14dadfd7bf6744d94aba4959c838e7f..6e1bbaac5c96e7cca0f6eed6d7fe82a9d710c7ae 100644
--- a/python/examples/encryption/README_CN.md
+++ b/python/examples/encryption/README_CN.md
@@ -36,11 +36,11 @@ def serving_encryption():
 ## 启动加密预测服务
 CPU预测服务
 ```
-python -m paddle_serving_server.serve --model encrypt_server/ --port 9300 --use_encryption_model
+python -m paddle_serving_server.serve --model encrypt_server/ --port 9300 --use_encryption_model --encryption_rpc_port 9301
 ```
 GPU预测服务
 ```
-python -m paddle_serving_server.serve --model encrypt_server/ --port 9300 --use_encryption_model --gpu_ids 0
+python -m paddle_serving_server.serve --model encrypt_server/ --port 9300 --use_encryption_model --encryption_rpc_port 9301 --gpu_ids 0
 ```
 
 ## 预测