diff --git a/README.md b/README.md
index b4bbdac..82dde6e 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@
 
 <p align="center">
 	<a href="https://space.bilibili.com/34154740">bilibili主页 </a> |
-	<a href="">演示视频 </a> |
+	<a href="https://www.bilibili.com/video/BV1c7wuzSEqx/">演示视频 </a> |
     <a href="https://oshwhub.com/no_chicken/powerpico">硬件开源 </a>
 </p>
 
diff --git a/README_EN.md b/README_EN.md
index 9738786..0909005 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -23,7 +23,7 @@
 
 <p align="center">
 	<a href="https://space.bilibili.com/34154740">my bilibili</a> |
-	<a href="">demo video </a> |
+	<a href="https://www.bilibili.com/video/BV1c7wuzSEqx/">demo video </a> |
     <a href="https://oshwhub.com/no_chicken/powerpico">hardware open source</a>
 </p>