diff --git a/apps/jingrow/frontend/src/views/dev/AppDetail.vue b/apps/jingrow/frontend/src/views/dev/AppDetail.vue
index e32ac81..c75ce03 100644
--- a/apps/jingrow/frontend/src/views/dev/AppDetail.vue
+++ b/apps/jingrow/frontend/src/views/dev/AppDetail.vue
@@ -129,7 +129,7 @@
 import { ref, onMounted, computed } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { get_session_api_headers } from '@/shared/api/auth'
-import { NButton, NIcon, NSpin, NEmpty, useMessage } from 'naive-ui'
+import { NButton, NIcon, NSpin, NEmpty, useMessage, useDialog } from 'naive-ui'
 import { Icon } from '@iconify/vue'
 import axios from 'axios'
 import { t } from '@/shared/i18n'
@@ -138,6 +138,7 @@ import InstallProgressModal from './InstallProgressModal.vue'
 const route = useRoute()
 const router = useRouter()
 const message = useMessage()
+const dialog = useDialog()
 
 const loading = ref(true)
 const error = ref('')
@@ -197,6 +198,34 @@ async function installApp() {
     return
   }
   
+  // 先检查应用是否已存在
+  try {
+    const appName = app.value.app_name || app.value.name
+    if (appName) {
+      const checkResponse = await axios.get(`/jingrow/check-app/${appName}`)
+      
+      if (checkResponse.data.exists) {
+        // 显示确认对话框
+        dialog.warning({
+          title: t('应用已存在'),
+          content: t('应用 "{0}" 已安装，是否覆盖安装？').replace('{0}', appName),
+          positiveText: t('确认覆盖'),
+          negativeText: t('取消'),
+          onPositiveClick: () => {
+            performInstall()
+          }
+        })
+        return
+      }
+    }
+  } catch (error) {
+    console.error('Check app exists error:', error)
+  }
+  
+  performInstall()
+}
+
+async function performInstall() {
   try {
     installing.value = true
     installProgress.value = 0
diff --git a/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue b/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue
index 9d9a00e..a01cf6d 100644
--- a/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue
+++ b/apps/jingrow/frontend/src/views/dev/AppMarketplace.vue
@@ -145,7 +145,7 @@
 <script setup lang="ts">
 import { ref, onMounted, computed, watch } from 'vue'
 import { useRouter } from 'vue-router'
-import { NInput, NButton, NIcon, NSpin, NEmpty, NSelect, NPagination, useMessage } from 'naive-ui'
+import { NInput, NButton, NIcon, NSpin, NEmpty, NSelect, NPagination, useMessage, useDialog } from 'naive-ui'
 import { Icon } from '@iconify/vue'
 import axios from 'axios'
 import { t } from '@/shared/i18n'
@@ -153,6 +153,7 @@ import { get_session_api_headers } from '@/shared/api/auth'
 import InstallProgressModal from './InstallProgressModal.vue'
 
 const message = useMessage()
+const dialog = useDialog()
 const router = useRouter()
 
 const searchQuery = ref('')
@@ -236,6 +237,34 @@ async function installApp(app: any) {
     return
   }
   
+  // 先检查应用是否已存在
+  try {
+    const appName = app.app_name || app.name
+    if (appName) {
+      const checkResponse = await axios.get(`/jingrow/check-app/${appName}`)
+      
+      if (checkResponse.data.exists) {
+        // 显示确认对话框
+        dialog.warning({
+          title: t('应用已存在'),
+          content: t('应用 "{0}" 已安装，是否覆盖安装？').replace('{0}', appName),
+          positiveText: t('确认覆盖'),
+          negativeText: t('取消'),
+          onPositiveClick: () => {
+            performInstall(app)
+          }
+        })
+        return
+      }
+    }
+  } catch (error) {
+    console.error('Check app exists error:', error)
+  }
+  
+  performInstall(app)
+}
+
+async function performInstall(app: any) {
   try {
     installing.value = true
     installProgress.value = 0
diff --git a/apps/jingrow/jingrow/api/local_app_installer.py b/apps/jingrow/jingrow/api/local_app_installer.py
index 99c3d9b..f5d11a2 100644
--- a/apps/jingrow/jingrow/api/local_app_installer.py
+++ b/apps/jingrow/jingrow/api/local_app_installer.py
@@ -190,6 +190,36 @@ async def install_app_from_upload(
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@router.get("/jingrow/check-app/{app_name}")
+async def check_app_exists(app_name: str):
+    """检查应用或扩展包是否已安装"""
+    try:
+        from jingrow.utils.jingrow_api import get_single_pagetype, get_record_list
+        
+        # 1. 检查应用是否已安装
+        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:
+                if app.get('app_name', '') == app_name:
+                    return {'exists': True, 'installed': True, 'type': 'app'}
+        
+        # 2. 检查扩展包是否已安装（通过查询Package PageType）
+        package_result = get_record_list("Package", filters=[["name", "=", app_name]], limit=1)
+        
+        if package_result.get('success') and package_result.get('data'):
+            # 如果找到了记录
+            if len(package_result.get('data', [])) > 0:
+                return {'exists': True, 'installed': False, 'type': 'package'}
+        
+        return {'exists': False, 'installed': False}
+    except Exception as e:
+        return {'exists': False, 'installed': False, 'error': str(e)}
+
+
 @router.get("/jingrow/local-apps")
 async def get_local_apps(request: Request):
     """扫描本地未安装的App"""