diff --git a/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue b/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue
index a01cf6d..1710049 100644
--- a/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue
+++ b/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue
@@ -94,7 +94,18 @@
             <n-button type="default" @click="viewAppDetail(app)">
               {{ t('View Details') }}
             </n-button>
-            <n-button type="primary" @click="installApp(app)">
+            <n-button 
+              v-if="isAppInstalled(app.app_name || app.name)"
+              type="warning" 
+              @click="installApp(app)"
+            >
+              {{ t('Update') }}
+            </n-button>
+            <n-button 
+              v-else
+              type="primary" 
+              @click="installApp(app)"
+            >
               {{ t('Install') }}
             </n-button>
           </div>
@@ -171,6 +182,9 @@ const installMessage = ref('')
 const installStatus = ref<'success' | 'error' | 'info'>('info')
 const showProgressModal = ref(false)
 
+// 已安装应用集合
+const installedAppNames = ref<Set<string>>(new Set())
+
 // 排序选项
 const sortOptions = computed(() => [
   { label: t('Latest'), value: 'creation desc' },
@@ -300,6 +314,9 @@ async function performInstall(app: any) {
       installMessage.value = t('应用安装成功！')
       message.success(t('应用安装成功'))
       
+      // 刷新已安装应用列表
+      loadInstalledApps()
+      
       setTimeout(() => {
         showProgressModal.value = false
       }, 2000)
@@ -341,8 +358,41 @@ function truncateText(text: string, maxLength: number): string {
   return text.substring(0, maxLength) + '...'
 }
 
+// 加载已安装应用列表
+async function loadInstalledApps() {
+  try {
+    const cached = sessionStorage.getItem('installed_apps_names')
+    if (cached) {
+      const data = JSON.parse(cached)
+      if (Date.now() - data.timestamp < 30 * 60 * 1000) {
+        installedAppNames.value = new Set(data.apps || [])
+        return
+      }
+    }
+    
+    const response = await axios.get('/jingrow/installed-app-names')
+    if (response.data.success) {
+      const apps = response.data.apps || []
+      installedAppNames.value = new Set(apps)
+      sessionStorage.setItem('installed_apps_names', JSON.stringify({
+        apps,
+        timestamp: Date.now()
+      }))
+    }
+  } catch (error) {
+    console.error('Load installed apps error:', error)
+  }
+}
+
+// 检查应用是否已安装
+function isAppInstalled(appName: string): boolean {
+  if (!appName) return false
+  return installedAppNames.value.has(appName.toLowerCase())
+}
+
 onMounted(() => {
   loadApps()
+  loadInstalledApps()
 })
 
 // 监听搜索和排序变化
diff --git a/apps/jingrow/jingrow/api/local_app_installer.py b/apps/jingrow/jingrow/api/local_app_installer.py
index f5d11a2..53dae00 100644
--- a/apps/jingrow/jingrow/api/local_app_installer.py
+++ b/apps/jingrow/jingrow/api/local_app_installer.py
@@ -220,6 +220,37 @@ async def check_app_exists(app_name: str):
         return {'exists': False, 'installed': False, 'error': str(e)}
 
 
+@router.get("/jingrow/installed-app-names")
+async def get_installed_app_names():
+    """获取所有已安装的应用名称列表"""
+    try:
+        from jingrow.utils.jingrow_api import get_single_pagetype, get_record_list
+        
+        installed = set()
+        
+        # 从 Local Installed Apps 获取应用列表
+        result = get_single_pagetype("Local Installed Apps")
+        if result.get('success'):
+            config = result.get('config', {})
+            local_installed_apps = config.get('local_installed_apps', [])
+            for app in local_installed_apps:
+                app_name = app.get('app_name', '')
+                if app_name:
+                    installed.add(app_name.lower())
+        
+        # 从 Package PageType 获取扩展包列表
+        package_result = get_record_list("Package", fields=["name"], limit=1000)
+        if package_result.get('success') and package_result.get('data'):
+            for pkg in package_result.get('data', []):
+                pkg_name = pkg.get('name', '')
+                if pkg_name:
+                    installed.add(pkg_name.lower())
+        
+        return {'success': True, 'apps': list(installed)}
+    except Exception as e:
+        return {'success': False, 'error': str(e), 'apps': []}
+
+
 @router.get("/jingrow/local-apps")
 async def get_local_apps(request: Request):
     """扫描本地未安装的App"""