diff --git a/user-frontend/package-lock.json b/user-frontend/package-lock.json
index 129618a..75118fd 100644
--- a/user-frontend/package-lock.json
+++ b/user-frontend/package-lock.json
@@ -14,6 +14,7 @@
         "element-plus": "^2.9.1",
         "pinia": "^2.3.0",
         "vue": "^3.5.13",
+        "vue-i18n": "^9.14.4",
         "vue-router": "^4.5.0"
       },
       "devDependencies": {
@@ -553,6 +554,50 @@
       "integrity": "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg==",
       "license": "MIT"
     },
+    "node_modules/@intlify/core-base": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/@intlify/core-base/-/core-base-9.14.4.tgz",
+      "integrity": "sha512-vtZCt7NqWhKEtHa3SD/322DlgP5uR9MqWxnE0y8Q0tjDs9H5Lxhss+b5wv8rmuXRoHKLESNgw9d+EN9ybBbj9g==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/message-compiler": "9.14.4",
+        "@intlify/shared": "9.14.4"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
+    "node_modules/@intlify/message-compiler": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/@intlify/message-compiler/-/message-compiler-9.14.4.tgz",
+      "integrity": "sha512-vcyCLiVRN628U38c3PbahrhbbXrckrM9zpy0KZVlDk2Z0OnGwv8uQNNXP3twwGtfLsCf4gu3ci6FMIZnPaqZsw==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/shared": "9.14.4",
+        "source-map-js": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
+    "node_modules/@intlify/shared": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/@intlify/shared/-/shared-9.14.4.tgz",
+      "integrity": "sha512-P9zv6i1WvMc9qDBWvIgKkymjY2ptIiQ065PjDv7z7fDqH3J/HBRBN5IoiR46r/ujRcU7hCuSIZWvCAFCyuOYZA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
     "node_modules/@jridgewell/sourcemap-codec": {
       "version": "1.5.5",
       "resolved": "https://registry.npmmirror.com/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
@@ -1990,6 +2035,26 @@
         }
       }
     },
+    "node_modules/vue-i18n": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/vue-i18n/-/vue-i18n-9.14.4.tgz",
+      "integrity": "sha512-B934C8yUyWLT0EMud3DySrwSUJI7ZNiWYsEEz2gknTthqKiG4dzWE/WSa8AzCuSQzwBEv4HtG1jZDhgzPfWSKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/core-base": "9.14.4",
+        "@intlify/shared": "9.14.4",
+        "@vue/devtools-api": "^6.5.0"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      },
+      "peerDependencies": {
+        "vue": "^3.0.0"
+      }
+    },
     "node_modules/vue-router": {
       "version": "4.6.4",
       "resolved": "https://registry.npmmirror.com/vue-router/-/vue-router-4.6.4.tgz",
diff --git a/user-frontend/package.json b/user-frontend/package.json
index 5bd60a1..d39d1a7 100644
--- a/user-frontend/package.json
+++ b/user-frontend/package.json
@@ -15,6 +15,7 @@
     "element-plus": "^2.9.1",
     "pinia": "^2.3.0",
     "vue": "^3.5.13",
+    "vue-i18n": "^9.14.4",
     "vue-router": "^4.5.0"
   },
   "devDependencies": {
diff --git a/user-frontend/src/i18n.js b/user-frontend/src/i18n.js
new file mode 100644
index 0000000..0dfb8c4
--- /dev/null
+++ b/user-frontend/src/i18n.js
@@ -0,0 +1,22 @@
+import { createI18n } from 'vue-i18n'
+import zhCN from './locales/zh-CN.json'
+import en from './locales/en.json'
+
+const savedLang = localStorage.getItem('lang') || 'zh-CN'
+
+const i18n = createI18n({
+  legacy: false,
+  locale: savedLang,
+  fallbackLocale: 'zh-CN',
+  messages: {
+    'zh-CN': zhCN,
+    'en': en,
+  },
+})
+
+export function switchLang(lang) {
+  i18n.global.locale.value = lang
+  localStorage.setItem('lang', lang)
+}
+
+export default i18n
diff --git a/user-frontend/src/layouts/UserLayout.vue b/user-frontend/src/layouts/UserLayout.vue
index bb25f1a..aaa8228 100644
--- a/user-frontend/src/layouts/UserLayout.vue
+++ b/user-frontend/src/layouts/UserLayout.vue
@@ -16,16 +16,16 @@
         :collapse-transition="false"
         @select="showMobileMenu = false"
       >
-        <el-menu-item index="/discovery"><el-icon><Search /></el-icon><span>发现客户</span></el-menu-item>
-        <el-menu-item index="/workspace"><el-icon><Odometer /></el-icon><span>工作台</span></el-menu-item>
-        <el-menu-item index="/customers"><el-icon><User /></el-icon><span>客户管理</span></el-menu-item>
-        <el-menu-item index="/products"><el-icon><Goods /></el-icon><span>产品库</span></el-menu-item>
-        <el-menu-item index="/quotations"><el-icon><DocumentCopy /></el-icon><span>报价单</span></el-menu-item>
-        <el-menu-item index="/translate"><el-icon><ChatLineSquare /></el-icon><span>智能翻译</span></el-menu-item>
-        <el-menu-item index="/marketing"><el-icon><Promotion /></el-icon><span>营销素材</span></el-menu-item>
-        <el-menu-item index="/followup"><el-icon><Message /></el-icon><span>智能跟进</span></el-menu-item>
-        <el-menu-item index="/analytics"><el-icon><DataAnalysis /></el-icon><span>数据分析</span></el-menu-item>
-        <el-menu-item index="/team"><el-icon><UserFilled /></el-icon><span>团队协作</span></el-menu-item>
+        <el-menu-item index="/discovery"><el-icon><Search /></el-icon><span>{{ $t('nav.discovery') }}</span></el-menu-item>
+        <el-menu-item index="/workspace"><el-icon><Odometer /></el-icon><span>{{ $t('nav.workspace') }}</span></el-menu-item>
+        <el-menu-item index="/customers"><el-icon><User /></el-icon><span>{{ $t('nav.customers') }}</span></el-menu-item>
+        <el-menu-item index="/products"><el-icon><Goods /></el-icon><span>{{ $t('nav.products') }}</span></el-menu-item>
+        <el-menu-item index="/quotations"><el-icon><DocumentCopy /></el-icon><span>{{ $t('nav.quotations') }}</span></el-menu-item>
+        <el-menu-item index="/translate"><el-icon><ChatLineSquare /></el-icon><span>{{ $t('nav.translate') }}</span></el-menu-item>
+        <el-menu-item index="/marketing"><el-icon><Promotion /></el-icon><span>{{ $t('nav.marketing') }}</span></el-menu-item>
+        <el-menu-item index="/followup"><el-icon><Message /></el-icon><span>{{ $t('nav.followup') }}</span></el-menu-item>
+        <el-menu-item index="/analytics"><el-icon><DataAnalysis /></el-icon><span>{{ $t('nav.analytics') }}</span></el-menu-item>
+        <el-menu-item index="/team"><el-icon><UserFilled /></el-icon><span>{{ $t('nav.team') }}</span></el-menu-item>
       </el-menu>
     </aside>
 
@@ -35,13 +35,14 @@
           <el-icon :size="20"><Expand /></el-icon>
         </el-button>
         <el-breadcrumb separator="/" class="breadcrumb">
-          <el-breadcrumb-item :to="'/workspace'">工作台</el-breadcrumb-item>
-          <el-breadcrumb-item v-if="route.meta?.title" :to="route.path">{{ route.meta.title }}</el-breadcrumb-item>
+          <el-breadcrumb-item :to="'/workspace'">{{ $t('nav.workspace') }}</el-breadcrumb-item>
+          <el-breadcrumb-item v-if="route.meta?.title" :to="route.path">{{ $t('nav.' + route.name?.toLowerCase()) || route.meta.title }}</el-breadcrumb-item>
         </el-breadcrumb>
         <div class="topbar-right">
+          <el-button text style="font-size:13px;color:#999" @click="toggleLang">{{ currentLang }}</el-button>
           <el-button v-if="creditBalance !== null" text class="credit-btn" @click="$router.push('/credits')">
             <el-icon><Coin /></el-icon>
-            <span class="credit-text">{{ creditBalance }} 次</span>
+            <span class="credit-text">{{ creditBalance }} {{ $t('topbar.credits') }}</span>
           </el-button>
           <el-badge :value="unread" :hidden="!unread" class="notif-badge">
             <el-button text style="font-size:18px" @click="$router.push('/notifications')">
@@ -56,9 +57,9 @@
             </el-button>
             <template #dropdown>
               <el-dropdown-menu>
-                <el-dropdown-item @click="$router.push('/profile')">个人中心</el-dropdown-item>
-                <el-dropdown-item @click="$router.push('/notifications')">通知中心</el-dropdown-item>
-                <el-dropdown-item divided @click="handleLogout">退出登录</el-dropdown-item>
+                <el-dropdown-item @click="$router.push('/profile')">{{ $t('nav.profile') }}</el-dropdown-item>
+                <el-dropdown-item @click="$router.push('/notifications')">{{ $t('nav.notifications') }}</el-dropdown-item>
+                <el-dropdown-item divided @click="handleLogout">{{ $t('common.confirm') }}退出</el-dropdown-item>
               </el-dropdown-menu>
             </template>
           </el-dropdown>
@@ -89,18 +90,27 @@
 <script setup>
 import { ref, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
+import { useI18n } from 'vue-i18n'
 import { useAuthStore } from '@/stores/auth'
 import { getUnreadCount, getCreditBalance } from '@/api'
 import AiAssistant from '@/components/AiAssistant.vue'
+import { switchLang } from '@/i18n'
 
 const route = useRoute()
 const router = useRouter()
+const { locale } = useI18n()
 const auth = useAuthStore()
 const collapsed = ref(false)
 const showMobileMenu = ref(false)
 const unread = ref(0)
 const creditBalance = ref(null)
 
+const currentLang = computed(() => locale.value === 'en' ? 'English' : '中文')
+function toggleLang() {
+  const next = locale.value === 'en' ? 'zh-CN' : 'en'
+  switchLang(next)
+}
+
 async function loadCreditBalance() {
   try {
     const res = await getCreditBalance()
diff --git a/user-frontend/src/locales/en.json b/user-frontend/src/locales/en.json
new file mode 100644
index 0000000..7507806
--- /dev/null
+++ b/user-frontend/src/locales/en.json
@@ -0,0 +1,79 @@
+{
+  "nav": {
+    "discovery": "Find Buyers",
+    "workspace": "Dashboard",
+    "customers": "Customers",
+    "products": "Products",
+    "quotations": "Quotations",
+    "translate": "Translate",
+    "marketing": "Marketing",
+    "followup": "Follow-ups",
+    "analytics": "Analytics",
+    "team": "Team",
+    "notifications": "Notifications",
+    "profile": "Profile",
+    "credits": "Buy Credits",
+    "settings": "Settings"
+  },
+  "topbar": {
+    "credits": "credits",
+    "purchase": "Buy Credits",
+    "notifications": "Notifications"
+  },
+  "discovery": {
+    "title": "Discover New Customers",
+    "subtitle": "Enter a product description to find potential buyers worldwide",
+    "product_placeholder": "e.g. LED lighting, solar panels, auto parts",
+    "market_placeholder": "Target market (e.g. US, Germany, leave empty for global)",
+    "search": "Search Buyers",
+    "searching": "Searching...",
+    "results": "Search Results",
+    "no_results": "No results found. Try different keywords",
+    "credits_cost": "Each search costs 10 credits",
+    "analyze": "Deep Analysis",
+    "outreach": "Generate Outreach",
+    "add_customer": "Add as Customer",
+    "visit_website": "Visit Website",
+    "match_score": "Match Score",
+    "contact": "Contact Info"
+  },
+  "credits": {
+    "title": "Credits",
+    "balance": "Current Balance",
+    "packages": "Buy Credits",
+    "subscription": "Subscription",
+    "history": "Transaction History",
+    "purchase": "Buy Now",
+    "subscribe": "Subscribe",
+    "per_month": "/month",
+    "per_credit": "per credit",
+    "pay_alipay": "Alipay",
+    "pay_wechat": "WeChat Pay",
+    "confirm_pay": "Confirm Payment",
+    "scan_pay": "Scan to Pay",
+    "insufficient": "Insufficient credits",
+    "buy_more": "Buy More",
+    "total_purchased": "Total Purchased",
+    "total_used": "Total Used"
+  },
+  "common": {
+    "loading": "Loading...",
+    "error": "Something went wrong",
+    "retry": "Retry",
+    "cancel": "Cancel",
+    "confirm": "Confirm",
+    "save": "Save",
+    "delete": "Delete",
+    "edit": "Edit",
+    "back": "Back",
+    "no_data": "No data",
+    "search": "Search",
+    "all": "All",
+    "status": "Status",
+    "time": "Time"
+  },
+  "lang": {
+    "switch_to": "中文",
+    "current": "English"
+  }
+}
\ No newline at end of file
diff --git a/user-frontend/src/locales/zh-CN.json b/user-frontend/src/locales/zh-CN.json
new file mode 100644
index 0000000..21a15b0
--- /dev/null
+++ b/user-frontend/src/locales/zh-CN.json
@@ -0,0 +1,79 @@
+{
+  "nav": {
+    "discovery": "发现客户",
+    "workspace": "工作台",
+    "customers": "客户管理",
+    "products": "产品库",
+    "quotations": "报价单",
+    "translate": "智能翻译",
+    "marketing": "营销素材",
+    "followup": "跟进提醒",
+    "analytics": "数据分析",
+    "team": "团队协作",
+    "notifications": "通知中心",
+    "profile": "个人中心",
+    "credits": "购买次数",
+    "settings": "设置"
+  },
+  "topbar": {
+    "credits": "次",
+    "purchase": "购买次数",
+    "notifications": "通知"
+  },
+  "discovery": {
+    "title": "发现新客户",
+    "subtitle": "输入产品关键词，找到全球潜在买家",
+    "product_placeholder": "例如：LED lighting, solar panels, auto parts",
+    "market_placeholder": "目标市场（如 US, Germany, 留空为全球）",
+    "search": "搜索买家",
+    "searching": "正在搜索...",
+    "results": "搜索结果",
+    "no_results": "暂无结果，请尝试其他关键词",
+    "credits_cost": "每次搜索消耗 10 次",
+    "analyze": "深度分析",
+    "outreach": "生成开发信",
+    "add_customer": "添加为客户",
+    "visit_website": "访问网站",
+    "match_score": "匹配度",
+    "contact": "联系方式"
+  },
+  "credits": {
+    "title": "信用次数",
+    "balance": "当前余额",
+    "packages": "购买次数",
+    "subscription": "订阅套餐",
+    "history": "消费记录",
+    "purchase": "立即购买",
+    "subscribe": "开通订阅",
+    "per_month": "次/月",
+    "per_credit": "次均",
+    "pay_alipay": "支付宝",
+    "pay_wechat": "微信支付",
+    "confirm_pay": "确认支付",
+    "scan_pay": "扫码支付",
+    "insufficient": "次数不足",
+    "buy_more": "去购买",
+    "total_purchased": "已购买",
+    "total_used": "已使用"
+  },
+  "common": {
+    "loading": "加载中...",
+    "error": "出错了",
+    "retry": "重试",
+    "cancel": "取消",
+    "confirm": "确认",
+    "save": "保存",
+    "delete": "删除",
+    "edit": "编辑",
+    "back": "返回",
+    "no_data": "暂无数据",
+    "search": "搜索",
+    "all": "全部",
+    "status": "状态",
+    "time": "时间"
+  },
+  "lang": {
+    "switch_to": "English",
+    "current": "中文"
+  }
+}
\ No newline at end of file
diff --git a/user-frontend/src/main.js b/user-frontend/src/main.js
index 2806f87..45772a4 100644
--- a/user-frontend/src/main.js
+++ b/user-frontend/src/main.js
@@ -6,10 +6,12 @@ import zhCn from 'element-plus/es/locale/lang/zh-cn'
 import * as ElementPlusIconsVue from '@element-plus/icons-vue'
 import App from './App.vue'
 import router from './router'
+import i18n from './i18n'
 
 const app = createApp(App)
 app.use(createPinia())
 app.use(router)
+app.use(i18n)
 app.use(ElementPlus, { locale: zhCn })
 for (const [k, v] of Object.entries(ElementPlusIconsVue)) app.component(k, v)
 app.mount('#app')