diff --git a/notes/27. 二叉树的镜像.md b/notes/27. 二叉树的镜像.md
index 7f803db4..940e616c 100644
--- a/notes/27. 二叉树的镜像.md	
+++ b/notes/27. 二叉树的镜像.md	
@@ -4,7 +4,7 @@
 
 ## 题目描述
 
-<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/0c12221f-729e-4c22-b0ba-0dfc909f8adf.jpg" width="300"/> </div><br>
+<div align="center"> <img src="pics/offer27-mirror-tree.png" width="560px"/> </div><br>
 
 ## 解题思路
 
diff --git a/notes/pics/offer27-mirror-tree.png b/notes/pics/offer27-mirror-tree.png
new file mode 100644
index 00000000..7e2c8c61
Binary files /dev/null and b/notes/pics/offer27-mirror-tree.png differ