diff --git a/qy_lty/device_interaction/management/commands/create_fallback_device.py b/qy_lty/device_interaction/management/commands/create_fallback_device.py
new file mode 100644
index 0000000..2d50adb
--- /dev/null
+++ b/qy_lty/device_interaction/management/commands/create_fallback_device.py
@@ -0,0 +1,102 @@
+from django.core.management.base import BaseCommand
+from django.utils import timezone
+from device_interaction.models import DeviceType, DeviceBatch, Device, UserDevice
+from userapp.models import ParadiseUser
+
+FALLBACK_MAC = '00:55:11:44:f3:22'
+
+
+class Command(BaseCommand):
+    help = '创建 Unity Editor 测试用兜底设备（MAC: 00:55:11:44:f3:22）并绑定到指定用户'
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--username',
+            type=str,
+            default='',
+            help='绑定到哪个用户（username），不填则自动选第一个超级管理员'
+        )
+
+    def handle(self, *args, **options):
+        # 1. 找用户
+        username = options['username']
+        if username:
+            try:
+                user = ParadiseUser.objects.get(username=username)
+            except ParadiseUser.DoesNotExist:
+                self.stdout.write(self.style.ERROR(f'用户 "{username}" 不存在'))
+                return
+        else:
+            user = ParadiseUser.objects.filter(is_superuser=True).first()
+            if not user:
+                user = ParadiseUser.objects.first()
+            if not user:
+                self.stdout.write(self.style.ERROR('数据库中没有任何用户，请先创建用户'))
+                return
+        self.stdout.write(f'绑定目标用户: {user.username} (id={user.id})')
+
+        # 2. 获取或创建设备类型
+        device_type, created = DeviceType.objects.get_or_create(
+            code='T01',
+            defaults={
+                'name': '测试设备类型',
+                'description': 'Unity Editor 本地测试用'
+            }
+        )
+        if created:
+            self.stdout.write(self.style.SUCCESS(f'创建设备类型: {device_type.name} (T01)'))
+        else:
+            self.stdout.write(f'使用已有设备类型: {device_type.name} (T01)')
+
+        # 3. 获取或创建批次
+        batch, created = DeviceBatch.objects.get_or_create(
+            batch_number='BT01-TEST',
+            defaults={
+                'device_type': device_type,
+                'production_date': timezone.now().date(),
+                'quantity': 1,
+                'description': 'Unity Editor 测试批次'
+            }
+        )
+        if created:
+            self.stdout.write(self.style.SUCCESS(f'创建批次: {batch.batch_number}'))
+        else:
+            self.stdout.write(f'使用已有批次: {batch.batch_number}')
+
+        # 4. 获取或创建设备
+        device, created = Device.objects.get_or_create(
+            mac_address=FALLBACK_MAC,
+            defaults={
+                'device_type': device_type,
+                'batch': batch,
+                'serial_number': 'TEST-001',
+                'is_active': True,
+                'activated_at': timezone.now(),
+            }
+        )
+        if created:
+            self.stdout.write(self.style.SUCCESS(f'创建设备: {device.device_code} (MAC: {FALLBACK_MAC})'))
+        else:
+            self.stdout.write(f'设备已存在: {device.device_code} (MAC: {FALLBACK_MAC})')
+            # 确保已激活
+            if not device.is_active:
+                device.is_active = True
+                device.activated_at = timezone.now()
+                device.save()
+                self.stdout.write(self.style.SUCCESS('设备已更新为激活状态'))
+
+        # 5. 绑定用户
+        user_device, created = UserDevice.objects.get_or_create(
+            user=user,
+            device=device,
+            defaults={'nickname': 'Editor测试设备', 'is_primary': True}
+        )
+        if created:
+            self.stdout.write(self.style.SUCCESS(f'设备已绑定到用户 {user.username}'))
+        else:
+            self.stdout.write(f'设备已绑定过用户 {user.username}，跳过')
+
+        self.stdout.write(self.style.SUCCESS(
+            f'\n完成！现在可以用以下地址测试：\n'
+            f'https://qy-lty.airlabs.art/api/device/rtc-token/get_by_mac/?mac_address={FALLBACK_MAC}'
+        ))
diff --git a/qy_lty/device_interaction/serializers.py b/qy_lty/device_interaction/serializers.py
index a4d5f7d..1a7eb74 100644
--- a/qy_lty/device_interaction/serializers.py
+++ b/qy_lty/device_interaction/serializers.py
@@ -112,7 +112,17 @@ class DeviceBindSerializer(serializers.Serializer):
     
     def validate_mac_address(self, value):
         try:
-            Device.objects.get(mac_address=value)
+            device = Device.objects.get(mac_address=value)
+            # 检查设备是否已被激活
+            if not device.is_active:
+                device.is_active = True
+                device.activated_at = timezone.now()
+                device.save()
         except Device.DoesNotExist:
             raise serializers.ValidationError("设备不存在")
-        return value
\ No newline at end of file
+        
+        # 检查设备是否已被其他用户绑定
+        if UserDevice.objects.filter(device=device).exists():
+            raise serializers.ValidationError("设备已被其他用户绑定")
+        
+        return value 
\ No newline at end of file