diff --git a/docs/zh_CN/uiflow/Units.md b/docs/zh_CN/uiflow/Units.md
index 3b18b71a..209d6911 100644
--- a/docs/zh_CN/uiflow/Units.md
+++ b/docs/zh_CN/uiflow/Units.md
@@ -620,7 +620,7 @@ ________________________
 
 > 扩展IO接口
 
-><img src="/image/Units/Pb.HUB.png" width="30%"> 
+><img src="/image/Units/Pb.HUB.png" width="60%"> 
 
 >* __pos digitalRead__
 读取引脚数字值