diff --git a/docs/nginx-introduction.md b/docs/nginx-introduction.md
index eef5515..32f3bbd 100644
--- a/docs/nginx-introduction.md
+++ b/docs/nginx-introduction.md
@@ -33,7 +33,7 @@ Nginx 的高并发，官方测试支持 5 万并发连接。实际生产环境
 
 ### 主从模式
 
-![img](https://raw.githubusercontent.com/dunwu/images/master/snap/20200125161055.png)
+![img](http://dunwu.test.upcdn.net/snap/20200125161055.png)
 
 **Nginx 采用一主多从的主从架构**。