diff --git a/app.py b/app.py
index 7d0cd92..ca8b8f5 100644
--- a/app.py
+++ b/app.py
@@ -57,6 +57,15 @@ def get_auto_stop_time():
     except (ValueError, TypeError):
         return 15
 
+def get_demo_mode():
+    """
+    从 data/.env 文件中读取演示模式配置
+    如果未设置，返回默认值False
+    """
+    config = dotenv_values(ENV_FILE_PATH)
+    demo_mode = config.get('DEMO_MODE', 'False')
+    return demo_mode.lower() in ('true')
+
 def save_devices(devices):
     """
     将所有已连接的设备 ADB 地址保存到 data/.env 文件中
@@ -198,6 +207,9 @@ def handle_connect():
     # 发送自动停止时间
     auto_stop_time = get_auto_stop_time()
     emit('auto_stop_time', {'minutes': auto_stop_time})
+    # 发送演示模式状态
+    demo_mode = get_demo_mode()
+    emit('demo_mode', {'enabled': demo_mode})
     return True
 
 def get_current_mirroring_device_id():
@@ -220,6 +232,15 @@ def handle_device_connect(data):
             emit('connection_error', f'设备 {device_id} 已连接')
             return
         
+        # 演示模式验证
+        if get_demo_mode():
+            # 获取保存的设备列表（包含预设IP）
+            saved_devices = get_saved_devices()
+            # 检查设备ID是否在预设列表中
+            if not any(device['address'] == device_id for device in saved_devices):
+                emit('connection_error', '演示模式下只允许连接预设的设备')
+                return
+        
         # 尝试连接设备
         print(f'Trying to connect to device: {device_id}')
         success, output = device_manager.adb_manager.connect_to_device(ip, port)
@@ -287,6 +308,11 @@ def handle_delete_saved_device(data):
     """
     处理删除保存设备的请求
     """
+    # 演示模式验证
+    if get_demo_mode():
+        emit('error', {'message': '演示模式下不允许删除设备'})
+        return
+    
     device_address = data.get('device_id')
     try:
         # 从保存的设备列表中移除该设备（通过address字段）
diff --git a/templates/index.html b/templates/index.html
index 8ce2d40..62bc852 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -816,6 +816,45 @@ <h3>已保存的设备</h3>
             }
 
             let currentDeviceId = null;
+            let demoMode = false; // 演示模式状态
+
+            // 接收演示模式状态
+            socket.on('demo_mode', (data) => {
+                demoMode = data.enabled;
+                updateUIForDemoMode();
+            });
+
+            function updateUIForDemoMode() {
+                const deviceIpInput = document.getElementById('device-ip');
+                const devicePortInput = document.getElementById('device-port');
+                const connectBtn = document.getElementById('connect-btn');
+                
+                if (demoMode) {
+                    // 禁止"链接新设备"框的输入
+                    deviceIpInput.disabled = true;
+                    devicePortInput.disabled = true;
+                    // 连接按钮在演示模式下也保持启用，以便通过已保存的设备进行链接
+                    connectBtn.disabled = false;
+                } else {
+                    // 启用"链接新设备"框的输入
+                    deviceIpInput.disabled = false;
+                    devicePortInput.disabled = false;
+                    connectBtn.disabled = false;
+                }
+                
+                // 更新设备列表，隐藏或显示相关按钮
+                const savedDevices = document.querySelectorAll('#saved-devices-container .list-group-item');
+                savedDevices.forEach(item => {
+                    const deleteBtn = item.querySelector('.delete-saved-device-btn');
+                    if (demoMode) {
+                        // 前端不显示"已保存的设备"的"删除选项"
+                        if (deleteBtn) deleteBtn.style.display = 'none';
+                    } else {
+                        // 显示"已保存的设备"的"删除选项"
+                        if (deleteBtn) deleteBtn.style.display = 'inline-block';
+                    }
+                });
+            }
 
             function updateDeviceList(devices) {
                 if (!devices || devices.length === 0) {
@@ -832,6 +871,9 @@ <h3>已保存的设备</h3>
                         ? `<button class="stop-mirror-btn btn btn-danger btn-sm" data-device="${device.id}">停止镜像</button>`
                         : `<button class="start-mirror-btn btn btn-success btn-sm" data-device="${device.id}">开始镜像</button>`;
 
+                    // 始终显示重命名选项
+                    const renameButton = `<button class="rename-device-btn btn btn-info btn-sm" data-device="${device.id}" data-name="${deviceName}">重命名</button>`;
+
                     return `
                     <div class="list-group-item">
                         <div class="d-flex w-100 justify-content-between align-items-center">
@@ -842,7 +884,7 @@ <h3>已保存的设备</h3>
                         <div class="mt-2 d-flex gap-2">
                             ${actionButtons}
                             <button class="disconnect-btn btn btn-secondary btn-sm" data-device="${device.id}">断开连接</button>
-                            <button class="rename-device-btn btn btn-info btn-sm" data-device="${device.id}" data-name="${deviceName}">重命名</button>
+                            ${renameButton}
                         </div>
                     </div>
                 `;
@@ -913,6 +955,14 @@ <h3>已保存的设备</h3>
 
                 savedDevicesContainer.innerHTML = devices.map(device => {
                     const [ip, port] = device.address.split(':');
+                    
+                    // 始终显示重命名选项，演示模式下不显示删除选项
+                    const renameButton = `<button class="rename-saved-device-btn btn btn-secondary btn-sm" data-address="${device.address}" data-name="${device.name}">重命名</button>`;
+                    
+                    const deleteButton = demoMode 
+                        ? '' 
+                        : `<button class="delete-saved-device-btn btn btn-danger btn-sm" data-device="${device.address}">删除</button>`;
+                    
                     return `
                     <div class="list-group-item">
                         <div class="d-flex w-100 justify-content-between align-items-center">
@@ -921,8 +971,8 @@ <h3>已保存的设备</h3>
                         <div class="small text-muted">地址：${device.address}</div>
                         <div class="mt-2 d-flex gap-2">
                             <button class="connect-saved-device-btn btn btn-success btn-sm" data-ip="${ip}" data-port="${port}" data-address="${device.address}">连接</button>
-                            <button class="rename-saved-device-btn btn btn-secondary btn-sm" data-address="${device.address}" data-name="${device.name}">重命名</button>
-                            <button class="delete-saved-device-btn btn btn-danger btn-sm" data-device="${device.address}">删除</button>
+                            ${renameButton}
+                            ${deleteButton}
                         </div>
                     </div>
                 `;