diff --git a/src/app/(protected)/dashboard/layout.tsx b/src/app/(protected)/dashboard/layout.tsx
index d64703f..6f30114 100644
--- a/src/app/(protected)/dashboard/layout.tsx
+++ b/src/app/(protected)/dashboard/layout.tsx
@@ -16,13 +16,6 @@ interface LayoutProps {
   children: React.ReactNode;
 }
 
-interface WrongProblem {
-  id: string;
-  name: string;
-  status: string;
-  url?: string;
-}
-
 export default async function Layout({ children }: LayoutProps) {
   const session = await auth();
   const user = session?.user;
@@ -49,57 +42,14 @@ export default async function Layout({ children }: LayoutProps) {
         return <TeacherSidebar user={user} />;
       case "STUDENT":
       default:
-        // 学生（STUDENT）需要查询错题数据
-        return <AppSidebar user={user} wrongProblems={[]} />;
+        return <AppSidebar user={user} />;
     }
   };
 
-  // 只有学生才需要查询错题数据
-  let wrongProblemsData: WrongProblem[] = [];
-  if (fullUser.role === "STUDENT") {
-    // 查询未完成（未AC）题目的最新一次提交
-    const wrongProblems = await prisma.problem.findMany({
-      where: {
-        submissions: {
-          some: { userId: user.id },
-        },
-        NOT: {
-          submissions: {
-            some: { userId: user.id, status: "AC" },
-          },
-        },
-      },
-      select: {
-        id: true,
-        displayId: true,
-        localizations: {
-          where: { locale: "zh", type: "TITLE" },
-          select: { content: true },
-        },
-        submissions: {
-          where: { userId: user.id },
-          orderBy: { createdAt: "desc" },
-          take: 1,
-          select: {
-            status: true,
-          },
-        },
-      },
-    });
-
-    // 组装传递给 AppSidebar 的数据格式
-    wrongProblemsData = wrongProblems.map((p) => ({
-      id: p.id,
-      name: p.localizations[0]?.content || `题目${p.displayId}`,
-      status: p.submissions[0]?.status || "-",
-      url: `/problems/${p.id}`,
-    }));
-  }
-
   return (
     <SidebarProvider>
       {fullUser.role === "STUDENT" ? (
-        <AppSidebar user={user} wrongProblems={wrongProblemsData} />
+        <AppSidebar user={user} />
       ) : (
         renderSidebar()
       )}
diff --git a/src/app/(protected)/dashboard/page.tsx b/src/app/(protected)/dashboard/page.tsx
index 4f01488..0d490e1 100644
--- a/src/app/(protected)/dashboard/page.tsx
+++ b/src/app/(protected)/dashboard/page.tsx
@@ -3,14 +3,10 @@ import {
   BookOpen,
   CheckCircle,
   Clock,
-  TrendingUp,
   AlertCircle,
-  BarChart3,
   Target,
   Activity,
-  GraduationCapIcon,
 } from "lucide-react";
-import Link from "next/link";
 import {
   Card,
   CardContent,
@@ -22,7 +18,6 @@ import prisma from "@/lib/prisma";
 import { auth } from "@/lib/auth";
 import { redirect } from "next/navigation";
 import { Badge } from "@/components/ui/badge";
-import { Button } from "@/components/ui/button";
 import { Progress } from "@/components/ui/progress";
 
 interface Stats {
@@ -206,28 +201,6 @@ export default async function DashboardPage() {
               color: "text-purple-600",
             },
           ],
-          actions: [
-            {
-              label: "管理员管理",
-              href: "/dashboard/management",
-              icon: Target,
-            },
-            {
-              label: "学生管理",
-              href: "/dashboard/usermanagement/student",
-              icon: Users,
-            },
-            {
-              label: "教师管理",
-              href: "/dashboard/usermanagement/teacher",
-              icon: GraduationCapIcon,
-            },
-            {
-              label: "题目管理",
-              href: "/dashboard/usermanagement/problem",
-              icon: BookOpen,
-            },
-          ],
         };
       case "TEACHER":
         return {
@@ -253,28 +226,6 @@ export default async function DashboardPage() {
               color: "text-purple-600",
             },
           ],
-          actions: [
-            {
-              label: "学生管理",
-              href: "/dashboard/usermanagement/student",
-              icon: Users,
-            },
-            {
-              label: "题目管理",
-              href: "/dashboard/usermanagement/problem",
-              icon: BookOpen,
-            },
-            {
-              label: "完成情况",
-              href: "/dashboard/teacher/dashboard",
-              icon: BarChart3,
-            },
-            {
-              label: "课程管理",
-              href: "/dashboard/teacher/courses",
-              icon: BookOpen,
-            },
-          ],
         };
       default:
         return {
@@ -300,20 +251,6 @@ export default async function DashboardPage() {
               color: "text-purple-600",
             },
           ],
-          actions: [
-            {
-              label: "我的进度",
-              href: "/dashboard/student/dashboard",
-              icon: TrendingUp,
-            },
-            {
-              label: "我的课程",
-              href: "/dashboard/student/courses",
-              icon: GraduationCapIcon,
-            },
-            { label: "开始做题", href: "/problemset", icon: BookOpen },
-            { label: "个人设置", href: "/dashboard/management", icon: Target },
-          ],
         };
     }
   };
@@ -379,26 +316,6 @@ export default async function DashboardPage() {
         </Card>
       )}
 
-      {/* 快速操作 */}
-      <Card>
-        <CardHeader>
-          <CardTitle>快速操作</CardTitle>
-          <CardDescription>常用功能快速访问</CardDescription>
-        </CardHeader>
-        <CardContent>
-          <div className="grid gap-4 md:grid-cols-4">
-            {config.actions.map((action, index) => (
-              <Link key={index} href={action.href}>
-                <Button variant="outline" className="w-full justify-start">
-                  <action.icon className="mr-2 h-4 w-4" />
-                  {action.label}
-                </Button>
-              </Link>
-            ))}
-          </div>
-        </CardContent>
-      </Card>
-
       {/* 最近活动 */}
       <Card>
         <CardHeader>
diff --git a/src/components/nav-user.tsx b/src/components/nav-user.tsx
index c2040d0..1e77cfc 100644
--- a/src/components/nav-user.tsx
+++ b/src/components/nav-user.tsx
@@ -10,15 +10,17 @@ import {
   DropdownMenu,
   DropdownMenuContent,
   DropdownMenuGroup,
-  DropdownMenuItem,
   DropdownMenuLabel,
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
 import { signOut } from "next-auth/react";
-import { useRouter } from "next/navigation";
-import { BadgeCheck, ChevronsUpDown, UserPen, LogOut } from "lucide-react";
+import { useTranslations } from "next-intl";
+import { ChevronsUpDown, LogOut } from "lucide-react";
 import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
+import { SettingsButton } from "@/components/settings-button";
+import { DashboardButton } from "@/components/dashboard-button";
+import { DropdownMenuItem } from "@/components/ui/dropdown-menu";
 
 export function NavUser({
   user,
@@ -30,7 +32,8 @@ export function NavUser({
   };
 }) {
   const { isMobile } = useSidebar();
-  const router = useRouter();
+  const t = useTranslations("UserAvatar");
+  const avatarFallback = user.name?.charAt(0) || user.email?.charAt(0) || "U";
 
   async function handleLogout() {
     await signOut({
@@ -39,14 +42,6 @@ export function NavUser({
     });
   }
 
-  function handleAccount() {
-    if (user && user.email) {
-      router.replace("/dashboard/management");
-    } else {
-      router.replace("/sign-in");
-    }
-  }
-
   return (
     <SidebarMenu>
       <SidebarMenuItem>
@@ -58,7 +53,9 @@ export function NavUser({
             >
               <Avatar className="h-8 w-8 rounded-lg">
                 <AvatarImage src={user.avatar} alt={user.name} />
-                <AvatarFallback className="rounded-lg">CN</AvatarFallback>
+                <AvatarFallback className="rounded-lg">
+                  {avatarFallback}
+                </AvatarFallback>
               </Avatar>
               <div className="grid flex-1 text-left text-sm leading-tight">
                 <span className="truncate font-semibold">{user.name}</span>
@@ -77,7 +74,9 @@ export function NavUser({
               <div className="flex items-center gap-2 px-1 py-1.5 text-left text-sm">
                 <Avatar className="h-8 w-8 rounded-lg">
                   <AvatarImage src={user.avatar} alt={user.name} />
-                  <AvatarFallback className="rounded-lg">CN</AvatarFallback>
+                  <AvatarFallback className="rounded-lg">
+                    {avatarFallback}
+                  </AvatarFallback>
                 </Avatar>
                 <div className="grid flex-1 text-left text-sm leading-tight">
                   <span className="truncate font-semibold">{user.name}</span>
@@ -87,19 +86,13 @@ export function NavUser({
             </DropdownMenuLabel>
             <DropdownMenuSeparator />
             <DropdownMenuGroup>
-              <DropdownMenuItem onClick={handleAccount}>
-                <BadgeCheck />
-                账号
-              </DropdownMenuItem>
-              <DropdownMenuItem onClick={() => router.push("/sign-in")}>
-                <UserPen />
-                切换用户
-              </DropdownMenuItem>
+              <DashboardButton />
+              <SettingsButton />
             </DropdownMenuGroup>
             <DropdownMenuSeparator />
             <DropdownMenuItem onClick={handleLogout}>
               <LogOut />
-              登出
+              {t("LogOut")}
             </DropdownMenuItem>
           </DropdownMenuContent>
         </DropdownMenu>
diff --git a/src/components/sidebar/app-sidebar.tsx b/src/components/sidebar/app-sidebar.tsx
index 1412781..96e9f77 100644
--- a/src/components/sidebar/app-sidebar.tsx
+++ b/src/components/sidebar/app-sidebar.tsx
@@ -14,7 +14,6 @@ import { User } from "next-auth";
 import { siteConfig } from "@/config/site";
 import { NavMain } from "@/components/nav-main";
 import { NavUser } from "@/components/nav-user";
-import { NavProjects } from "@/components/nav-projects";
 import { NavSecondary } from "@/components/nav-secondary";
 import { Command, LifeBuoy, Send, Shield } from "lucide-react";
 import { useTranslations } from "next-intl";
@@ -27,10 +26,6 @@ const data = {
       icon: Shield,
       isActive: true,
       items: [
-        {
-          title: "我的进度",
-          url: "/dashboard/student/dashboard",
-        },
         {
           title: "开始做题",
           url: "/problemset",
@@ -39,6 +34,10 @@ const data = {
           title: "我的课程",
           url: "/dashboard/student/courses",
         },
+        {
+          title: "我的进度",
+          url: "/dashboard/student/dashboard",
+        },
         {
           title: "个人设置",
           url: "/dashboard/management",
@@ -93,14 +92,9 @@ const data = {
 
 interface AppSidebarProps {
   user: User;
-  wrongProblems: {
-    id: string;
-    name: string;
-    status: string;
-  }[];
 }
 
-export function AppSidebar({ user, wrongProblems, ...props }: AppSidebarProps) {
+export function AppSidebar({ user, ...props }: AppSidebarProps) {
   const t = useTranslations("Sidebar");
   const userInfo = {
     name: user.name ?? "",
@@ -129,7 +123,6 @@ export function AppSidebar({ user, wrongProblems, ...props }: AppSidebarProps) {
       </SidebarHeader>
       <SidebarContent>
         <NavMain items={data.navMain} />
-        <NavProjects projects={wrongProblems} />
         <NavSecondary items={data.navSecondary} className="mt-auto" />
       </SidebarContent>
       <SidebarFooter>