diff --git a/docs/zh-cn/microbit/IObit/IObit.md b/docs/zh-cn/microbit/IObit/IObit.md
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--- a/docs/zh-cn/microbit/IObit/IObit.md
+++ b/docs/zh-cn/microbit/IObit/IObit.md
@@ -22,11 +22,11 @@ IO:bit扩展板是一款功能强大的microbit扩展板，其引出microbit主
 
 IO:bit扩展板与microbit主板
 
-![IO:bit](picture/IObit.png)
+![IO:bit](picture/IObit.jpg)
 
 ## 硬件接口介绍
 
-![硬件接口](picture/Annotation_diagram.png)
+![硬件接口](picture/Annotation_diagram.jpg)
 
 ### IO:bit 引脚介绍
 
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