diff --git a/.vitepress/config.js b/.vitepress/config.js
index e0af23d..3708412 100644
--- a/.vitepress/config.js
+++ b/.vitepress/config.js
@@ -4,6 +4,11 @@ import mathjax3 from 'markdown-it-mathjax3';
 import { main_sidebar, chapter2, chapter3, chapter4, chapter5, chapter6, chapter7, chapter8, chapter9 } from './sidebar.js';
 import { nav } from './nav.js';
 import PanguPlugin from 'markdown-it-pangu'
+import { createWriteStream } from 'node:fs'
+import { resolve } from 'node:path'
+import { SitemapStream } from 'sitemap'
+
+const links = []
 
 const customElements = [
   'mjx-container',
@@ -152,5 +157,23 @@ export default withMermaid({
       },
     },
   },
+  transformHtml: (_, id, { pageData }) => {
+    if (!/[\\/]404\.html$/.test(id))
+      links.push({
+        // you might need to change this if not using clean urls mode
+        url: pageData.relativePath.replace(/((^|\/)index)?\.md$/, '$2'),
+        lastmod: pageData.lastUpdated
+      })
+  },
+  buildEnd: async ({ outDir }) => {
+    const sitemap = new SitemapStream({
+      hostname: 'https://hdu-cs.wiki/'
+    })
+    const writeStream = createWriteStream(resolve(outDir, 'sitemap.xml'))
+    sitemap.pipe(writeStream)
+    links.forEach((link) => sitemap.write(link))
+    sitemap.end()
+    await new Promise((r) => writeStream.on('finish', r))
+  },
 })
 
diff --git a/package-lock.json b/package-lock.json
index 40643ff..9c5bbec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,8 @@
         "@jupyterlab/theme-light-extension": "^4.0.3",
         "@vueuse/core": "^10.2.1",
         "markdown-it": "^13.0.1",
-        "markdown-it-pangu": "^1.0.2"
+        "markdown-it-pangu": "^1.0.2",
+        "sitemap": "^7.1.1"
       },
       "devDependencies": {
         "@mermaid-js/mermaid-mindmap": "^9.3.0",
@@ -1377,6 +1378,11 @@
       "integrity": "sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==",
       "dev": true
     },
+    "node_modules/@types/node": {
+      "version": "17.0.45",
+      "resolved": "https://registry.npmmirror.com/@types/node/-/node-17.0.45.tgz",
+      "integrity": "sha512-w+tIMs3rq2afQdsPJlODhoUEKzFP1ayaoyl1CcnwtIlsVe7K7bA1NGm4s3PraqTLlXnbIN84zuBlxBWo1u9BLw=="
+    },
     "node_modules/@types/prop-types": {
       "version": "15.7.5",
       "resolved": "https://registry.npmmirror.com/@types/prop-types/-/prop-types-15.7.5.tgz",
@@ -1392,6 +1398,14 @@
         "csstype": "^3.0.2"
       }
     },
+    "node_modules/@types/sax": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmmirror.com/@types/sax/-/sax-1.2.4.tgz",
+      "integrity": "sha512-pSAff4IAxJjfAXUG6tFkO7dsSbTmf8CtUpfhhZ5VhkRpC4628tJhh3+V6H1E+/Gs9piSzYKT5yzHO5M4GG9jkw==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/scheduler": {
       "version": "0.16.3",
       "resolved": "https://registry.npmmirror.com/@types/scheduler/-/scheduler-0.16.3.tgz",
@@ -1742,6 +1756,11 @@
       "integrity": "sha512-lEm8mt52to2fT8GhciPCGeCXACSz2UwIN4X2e2LJSnZ5uAbn2/dsYdOmUXq0AtWS5cpAupysIneExOgH0Vd2TQ==",
       "dev": true
     },
+    "node_modules/arg": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmmirror.com/arg/-/arg-5.0.2.tgz",
+      "integrity": "sha512-PYjyFOLKQ9y57JvQ6QLo8dAgNqswh8M1RMJYdQduT6xbWSgK36P/Z/v+p888pM69jMMfS8Xd8F6I1kQ/I9HUGg=="
+    },
     "node_modules/argparse": {
       "version": "2.0.1",
       "resolved": "https://registry.npmmirror.com/argparse/-/argparse-2.0.1.tgz",
@@ -3516,6 +3535,11 @@
         "postcss": "^8.3.11"
       }
     },
+    "node_modules/sax": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmmirror.com/sax/-/sax-1.2.4.tgz",
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
+    },
     "node_modules/scheduler": {
       "version": "0.23.0",
       "resolved": "https://registry.npmmirror.com/scheduler/-/scheduler-0.23.0.tgz",
@@ -3567,6 +3591,24 @@
         "vscode-textmate": "^8.0.0"
       }
     },
+    "node_modules/sitemap": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmmirror.com/sitemap/-/sitemap-7.1.1.tgz",
+      "integrity": "sha512-mK3aFtjz4VdJN0igpIJrinf3EO8U8mxOPsTBzSsy06UtjZQJ3YY3o3Xa7zSc5nMqcMrRwlChHZ18Kxg0caiPBg==",
+      "dependencies": {
+        "@types/node": "^17.0.5",
+        "@types/sax": "^1.2.1",
+        "arg": "^5.0.0",
+        "sax": "^1.2.4"
+      },
+      "bin": {
+        "sitemap": "dist/cli.js"
+      },
+      "engines": {
+        "node": ">=12.0.0",
+        "npm": ">=5.6.0"
+      }
+    },
     "node_modules/slick": {
       "version": "1.12.2",
       "resolved": "https://registry.npmmirror.com/slick/-/slick-1.12.2.tgz",
@@ -5568,6 +5610,11 @@
       "integrity": "sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==",
       "dev": true
     },
+    "@types/node": {
+      "version": "17.0.45",
+      "resolved": "https://registry.npmmirror.com/@types/node/-/node-17.0.45.tgz",
+      "integrity": "sha512-w+tIMs3rq2afQdsPJlODhoUEKzFP1ayaoyl1CcnwtIlsVe7K7bA1NGm4s3PraqTLlXnbIN84zuBlxBWo1u9BLw=="
+    },
     "@types/prop-types": {
       "version": "15.7.5",
       "resolved": "https://registry.npmmirror.com/@types/prop-types/-/prop-types-15.7.5.tgz",
@@ -5583,6 +5630,14 @@
         "csstype": "^3.0.2"
       }
     },
+    "@types/sax": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmmirror.com/@types/sax/-/sax-1.2.4.tgz",
+      "integrity": "sha512-pSAff4IAxJjfAXUG6tFkO7dsSbTmf8CtUpfhhZ5VhkRpC4628tJhh3+V6H1E+/Gs9piSzYKT5yzHO5M4GG9jkw==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/scheduler": {
       "version": "0.16.3",
       "resolved": "https://registry.npmmirror.com/@types/scheduler/-/scheduler-0.16.3.tgz",
@@ -5816,6 +5871,11 @@
       "integrity": "sha512-lEm8mt52to2fT8GhciPCGeCXACSz2UwIN4X2e2LJSnZ5uAbn2/dsYdOmUXq0AtWS5cpAupysIneExOgH0Vd2TQ==",
       "dev": true
     },
+    "arg": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmmirror.com/arg/-/arg-5.0.2.tgz",
+      "integrity": "sha512-PYjyFOLKQ9y57JvQ6QLo8dAgNqswh8M1RMJYdQduT6xbWSgK36P/Z/v+p888pM69jMMfS8Xd8F6I1kQ/I9HUGg=="
+    },
     "argparse": {
       "version": "2.0.1",
       "resolved": "https://registry.npmmirror.com/argparse/-/argparse-2.0.1.tgz",
@@ -7293,6 +7353,11 @@
         "postcss": "^8.3.11"
       }
     },
+    "sax": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmmirror.com/sax/-/sax-1.2.4.tgz",
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
+    },
     "scheduler": {
       "version": "0.23.0",
       "resolved": "https://registry.npmmirror.com/scheduler/-/scheduler-0.23.0.tgz",
@@ -7335,6 +7400,17 @@
         "vscode-textmate": "^8.0.0"
       }
     },
+    "sitemap": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmmirror.com/sitemap/-/sitemap-7.1.1.tgz",
+      "integrity": "sha512-mK3aFtjz4VdJN0igpIJrinf3EO8U8mxOPsTBzSsy06UtjZQJ3YY3o3Xa7zSc5nMqcMrRwlChHZ18Kxg0caiPBg==",
+      "requires": {
+        "@types/node": "^17.0.5",
+        "@types/sax": "^1.2.1",
+        "arg": "^5.0.0",
+        "sax": "^1.2.4"
+      }
+    },
     "slick": {
       "version": "1.12.2",
       "resolved": "https://registry.npmmirror.com/slick/-/slick-1.12.2.tgz",
diff --git a/package.json b/package.json
index c996506..7448d20 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "@jupyterlab/theme-light-extension": "^4.0.3",
     "@vueuse/core": "^10.2.1",
     "markdown-it": "^13.0.1",
-    "markdown-it-pangu": "^1.0.2"
+    "markdown-it-pangu": "^1.0.2",
+    "sitemap": "^7.1.1"
   },
   "devDependencies": {
     "@mermaid-js/mermaid-mindmap": "^9.3.0",