diff --git a/docs/_coverpage.md b/docs/_coverpage.md
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--- a/docs/_coverpage.md
+++ b/docs/_coverpage.md
@@ -1,7 +1,7 @@
-# Handsome Theme <small>5.1 Pro</small>
+# Digital Clock <small>for EEE116</small>
 
-界面一见倾心，功能满足幻想
+一见倾心，满足幻想
 
-[联系作者](https://www.ihewro.com/)
+[联系作者](https://www.eee.dog/)
 [开始使用](/start)
 
diff --git a/docs/instro.md b/docs/instro.md
new file mode 100644
index 0000000..7a8b5e1
--- /dev/null
+++ b/docs/instro.md
@@ -0,0 +1,7 @@
+### 效果图
+![Demo_effect](https://cloud.yimian.xyz/package/iotcat/digital-clock/pic/demo.gif)
+### 电路实物图
+请参考以下图片搭建你的电路！
+![One Demo of Circuit](https://cloud.yimian.xyz/package/iotcat/digital-clock/pic/circuit_pic.jpg)
+### Arduino Nano推荐连法
+![Arduino Nano](https://cloud.yimian.xyz/package/iotcat/digital-clock/pic/nano_pic.jpg)