diff --git a/backend/db.js b/backend/db.js
index 2780f32..9fcb92b 100644
--- a/backend/db.js
+++ b/backend/db.js
@@ -17,7 +17,14 @@ if (DB_TYPE === 'mysql') {
       host: process.env.MYSQL_HOST || 'localhost',
       port: parseInt(process.env.MYSQL_PORT) || 3306,
       dialect: 'mysql',
-      logging: process.env.NODE_ENV === 'development' ? console.log : false
+      logging: process.env.NODE_ENV === 'development' ? console.log : false,
+      // 连接池配置 - 提升并发处理能力
+      pool: {
+        max: 10,        // 最大连接数
+        min: 2,         // 最小连接数
+        acquire: 30000, // 获取连接超时时间(ms)
+        idle: 10000     // 连接空闲时间(ms)
+      }
     }
   );
   dbDialect = 'mysql';
@@ -25,7 +32,14 @@ if (DB_TYPE === 'mysql') {
   sequelize = new Sequelize({
     dialect: 'sqlite',
     storage: process.env.DB_PATH || './idc_management.db',
-    logging: process.env.NODE_ENV === 'development' ? console.log : false
+    logging: process.env.NODE_ENV === 'development' ? console.log : false,
+    // SQLite 连接池配置
+    pool: {
+      max: 5,
+      min: 1,
+      acquire: 30000,
+      idle: 10000
+    }
   });
   dbDialect = 'sqlite';
 }
diff --git a/backend/routes/devices.js b/backend/routes/devices.js
index f7d9ac2..7fcd7ab 100644
--- a/backend/routes/devices.js
+++ b/backend/routes/devices.js
@@ -98,7 +98,7 @@ router.get('/', validateQuery(queryDeviceSchema), async (req, res) => {
       where.rackId = rackId;
     }
 
-    // 执行查询
+    // 执行查询 - 优化：使用 JOIN 避免 N+1 查询问题
     const { count, rows } = await Device.findAndCountAll({
       where,
       include: [
@@ -106,11 +106,14 @@ router.get('/', validateQuery(queryDeviceSchema), async (req, res) => {
           model: Rack,
           include: [
             { model: Room }
-          ]
+          ],
+          separate: false  // 强制使用 JOIN 而不是单独查询
         }
       ],
       offset,
-      limit: parseInt(pageSize)
+      limit: parseInt(pageSize),
+      distinct: true,      // 避免 count 不准确
+      subQuery: false      // 避免子查询导致的性能问题
     });
 
     res.json({
diff --git a/backend/routes/racks.js b/backend/routes/racks.js
index 88b069b..7ca3e70 100644
--- a/backend/routes/racks.js
+++ b/backend/routes/racks.js
@@ -39,15 +39,16 @@ router.get('/', async (req, res) => {
     // 获取总记录数（带筛选条件）
     const total = await Rack.count({ where });
 
-    // 获取分页数据
+    // 获取分页数据 - 优化：使用 JOIN 避免 N+1 查询问题
     const racks = await Rack.findAll({
       where,
       include: [
-        { model: Room },
-        { model: Device }
+        { model: Room, separate: false },
+        { model: Device, separate: false }
       ],
       limit: pageSize,
-      offset: offset
+      offset: offset,
+      subQuery: false  // 避免子查询导致的性能问题
     });
 
     // 返回带分页信息的响应
@@ -220,9 +221,10 @@ router.get('/:rackId', async (req, res) => {
   try {
     const rack = await Rack.findByPk(req.params.rackId, {
       include: [
-        { model: Room },
-        { model: Device }
-      ]
+        { model: Room, separate: false },
+        { model: Device, separate: false }
+      ],
+      subQuery: false  // 避免子查询导致的性能问题
     });
     if (!rack) {
       return res.status(404).json({ error: '机柜不存在' });
@@ -286,9 +288,10 @@ router.put('/:rackId', validateBody(updateRackSchema), async (req, res) => {
     if (updated) {
       const updatedRack = await Rack.findByPk(req.params.rackId, {
         include: [
-          { model: Room },
-          { model: Device }
-        ]
+          { model: Room, separate: false },
+          { model: Device, separate: false }
+        ],
+        subQuery: false  // 避免子查询导致的性能问题
       });
       res.json(updatedRack);
     } else {