diff --git a/notes/7. 重建二叉树.md b/notes/7. 重建二叉树.md
index 0d6bb881..c81df9ad 100644
--- a/notes/7. 重建二叉树.md	
+++ b/notes/7. 重建二叉树.md	
@@ -10,7 +10,7 @@
 
 
 
-<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191102210342488.png" width="400"/> </div><br>
+<div align="center"> <img src="pics/offer-rebuild-tree.png" width="560px"/> </div><br>
 
 ## 解题思路
 
diff --git a/notes/pics/offer-rebuild-tree.png b/notes/pics/offer-rebuild-tree.png
new file mode 100644
index 00000000..379e8d1e
Binary files /dev/null and b/notes/pics/offer-rebuild-tree.png differ