diff --git a/views/layout.pug b/views/layout.pug
index 2bd702c..026756b 100644
--- a/views/layout.pug
+++ b/views/layout.pug
@@ -19,17 +19,6 @@ html(lang='zh')
                     span.navbar-toggler-icon
                 #navbarNav.collapse.navbar-collapse
                     ul.navbar-nav
-                        li.nav-item
-                            a.nav-link(href='/poems') 背诗词
-                        li.nav-item
-                            a.nav-link(href='/sensehat/', target='_blank') SenseHAT
-                        li.nav-item.dropdown
-                            a.nav-link.dropdown-toggle(data-bs-toggle='dropdown', href='#', role='button', aria-haspopup='true', aria-expanded='false') 学习小组
-                            .dropdown-menu
-                                a.dropdown-item(href='/~xin/', target='_blank') 老爸
-                                a.dropdown-item(href='/~jun/', target='_blank') 鱼儿
-                                a.dropdown-item(href='/~yang/', target='_blank') 海洋
-                                .dropdown-divider
-                                a.dropdown-item(href='http://nas:3000/', target='_blank') 代码仓库
+                        include nav.pug
         .container-md.py-3
             block main
diff --git a/views/nav.pug b/views/nav.pug
new file mode 100644
index 0000000..fb06a38
--- /dev/null
+++ b/views/nav.pug
@@ -0,0 +1,18 @@
+li.nav-item
+    a.nav-link(href='/poems') 背诗词
+li.nav-item
+    a.nav-link(href='/sensehat/', target='_blank') SenseHAT
+li.nav-item
+li.nav-item.dropdown
+    a.nav-link.dropdown-toggle(data-bs-toggle='dropdown', href='#', role='button', aria-haspopup='true', aria-expanded='false') 数学
+    .dropdown-menu
+        a.dropdown-item(href='http://nas:3000/zhao/math', target='_blank') 数学笔记
+        a.dropdown-item(href='https://www.shuxuele.com/', target='_blank') 数学乐
+li.nav-item.dropdown
+    a.nav-link.dropdown-toggle(data-bs-toggle='dropdown', href='#', role='button', aria-haspopup='true', aria-expanded='false') 学习小组
+    .dropdown-menu
+        a.dropdown-item(href='/~xin/', target='_blank') 老爸
+        a.dropdown-item(href='/~jun/', target='_blank') 鱼儿
+        a.dropdown-item(href='/~yang/', target='_blank') 海洋
+        .dropdown-divider
+        a.dropdown-item(href='http://nas:3000/', target='_blank') 代码仓库