diff --git a/index.html b/index.html
index 31bb0df..e6fa0ef 100644
--- a/index.html
+++ b/index.html
@@ -5,7 +5,31 @@
     <link rel="icon" href="/favicon.ico">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Classworks 作业板</title>
-    <meta name="description" content="记录，查看并同步作业" />
+
+    <!-- SEO -->
+    <meta name="description" content="Classworks —— 适用于班级大屏的作业板小工具，支持记录、查看并同步作业，开源免费。" />
+    <meta name="keywords" content="Classworks,作业板,班级大屏,作业管理,课表,作业同步,开源" />
+    <meta name="author" content="Sunwuyuan" />
+    <meta name="robots" content="index, follow" />
+    <link rel="canonical" href="https://cs.houlang.cloud/" />
+
+    <!-- Open Graph -->
+    <meta property="og:type" content="website" />
+    <meta property="og:title" content="Classworks 作业板" />
+    <meta property="og:description" content="适用于班级大屏的作业板小工具，支持记录、查看并同步作业，开源免费。" />
+    <meta property="og:url" content="https://cs.houlang.cloud/" />
+    <meta property="og:site_name" content="Classworks" />
+    <meta property="og:image" content="https://cs.houlang.cloud/pwa/image/pwa-512x512.png" />
+    <meta property="og:image:width" content="512" />
+    <meta property="og:image:height" content="512" />
+    <meta property="og:locale" content="zh_CN" />
+
+    <!-- Twitter Card -->
+    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:title" content="Classworks 作业板" />
+    <meta name="twitter:description" content="适用于班级大屏的作业板小工具，支持记录、查看并同步作业，开源免费。" />
+    <meta name="twitter:image" content="https://cs.houlang.cloud/pwa/image/pwa-512x512.png" />
+
     <link rel="apple-touch-icon" href="/image/apple-touch-icon.png" sizes="180x180" />
     <link rel="mask-icon" href="/image/mask-icon.svg" color="#212121" />
     <meta name="theme-color" content="#212121" />