diff --git a/doc/ABTEST_IN_PADDLE_SERVING.md b/doc/ABTEST_IN_PADDLE_SERVING.md
index 17497fecf680c7579319e4f148a6e0af764dcda5..e02acbd8a1a6cfdb296cedf32ad7b7afc63995d7 100644
--- a/doc/ABTEST_IN_PADDLE_SERVING.md
+++ b/doc/ABTEST_IN_PADDLE_SERVING.md
@@ -1,5 +1,7 @@
 # ABTEST in Paddle Serving
 
+([简体中文](./ABTEST_IN_PADDLE_SERVING_CN.md)|English)
+
 This document will use an example of text classification task based on IMDB dataset to show how to build a A/B Test framework using Paddle Serving. The structure relationship between the client and servers in the example is shown in the figure below.
 
 <img src="abtest.png" style="zoom:33%;" />