diff --git a/README.md b/README.md
index 3e6a6bbe..642091fb 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@
 
 <div align="center">
 	<a href = "https://github.com/heibaiying/Full-Stack-Notes"> 
-	<img width="500px" src="https://gitee.com/heibaiying/BigData-Notes/raw/master/pictures/weixin.png"/> 
+	<img width="258px" src="https://gitee.com/heibaiying/BigData-Notes/raw/master/pictures/weixin.jpg"/> 
 	</a> 
 </div>
 <div align="center"> <strong> 如果想要离线阅读，可以在公众号上发送 “bigdata” 获取离线阅读版的《大数据入门指南》！ </strong> </div>