diff --git a/README.md b/README.md
index 9f23c31..1168338 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,8 @@
 支持3个八度弹奏，支持自动播放内置曲目。
 
 好吧其实很水货。
-![demo1](https://raw.githubusercontent.com/jiacai-wang/piano-C51/master/pianoC51.jpg)
+![demo1](https://raw.githubusercontent.com/jiacai-wang/piano-C51/master/pianoC51_1.jpg)
+![demo2](https://raw.githubusercontent.com/jiacai-wang/piano-C51/master/pianoC51_2.jpg)
 
 
 a simple piano based on C51 microcontroller.