diff --git a/python/examples/imagenet/README.md b/python/examples/imagenet/README.md
index 5eba4892f5c394eaff999c1b36c457fc9c80b2d6..52518d211a4350284cea19546fb3e55d49fc265f 100644
--- a/python/examples/imagenet/README.md
+++ b/python/examples/imagenet/README.md
@@ -8,6 +8,13 @@ The example uses the ResNet50_vd model to perform the imagenet 1000 classificati
 ```
 sh get_model.sh
 ```
+
+### Install preprocess module
+
+```
+pip install paddle_serving_app
+```
+
 ### HTTP Infer
 
 launch server side
diff --git a/python/examples/imagenet/README_CN.md b/python/examples/imagenet/README_CN.md
index 074709a3705d83367f9cdce7cd6ba426167ccd32..3b865cf91ecb62dacd0be5d35fa97bc2e0d50ce3 100644
--- a/python/examples/imagenet/README_CN.md
+++ b/python/examples/imagenet/README_CN.md
@@ -8,6 +8,13 @@
 ```
 sh get_model.sh
 ```
+
+### 安装数据预处理模块
+
+```
+pip install paddle_serving_app
+```
+
 ### 执行HTTP预测服务
 
 启动server端
diff --git a/python/examples/senta/README.md b/python/examples/senta/README.md
index 9d6c3a0221f924e5d8f1893e6c618e3b2f88a3e1..88aac352110850a71ae0f9a28c1a98293f8e0ab9 100644
--- a/python/examples/senta/README.md
+++ b/python/examples/senta/README.md
@@ -4,6 +4,12 @@
 ```
 sh get_data.sh
 ```
+## Install preprocess module
+
+```
+pip install paddle_serving_app
+```
+
 ## Start http service
 ```
 python senta_web_service.py senta_bilstm_model/ workdir 9292
diff --git a/python/examples/senta/README_CN.md b/python/examples/senta/README_CN.md
index bb1e706554a57b29fc784d064dd4b550846f6e76..f5011334db768c5f0869c296769ead7cb38613d8 100644
--- a/python/examples/senta/README_CN.md
+++ b/python/examples/senta/README_CN.md
@@ -4,6 +4,11 @@
 ```
 sh get_data.sh
 ```
+## 安装数据预处理模块
+```
+pip install paddle_serving_app
+```
+
 ## 启动HTTP服务
 ```
 python senta_web_service.py senta_bilstm_model/ workdir 9292