diff --git a/frontend/mobile-app/lib/core/services/account_service.dart b/frontend/mobile-app/lib/core/services/account_service.dart
index c9bfee6b..4f45aa02 100644
--- a/frontend/mobile-app/lib/core/services/account_service.dart
+++ b/frontend/mobile-app/lib/core/services/account_service.dart
@@ -33,17 +33,12 @@ class DeviceHardwareInfo {
     this.isPhysicalDevice,
   });
 
+  /// 转换为 API 请求格式
+  /// 注意: 后端只接受 model, platform, osVersion 三个字段
   Map<String, dynamic> toJson() => {
-        if (brand != null) 'brand': brand,
-        if (manufacturer != null) 'manufacturer': manufacturer,
         if (model != null) 'model': model,
-        if (device != null) 'device': device,
-        if (product != null) 'product': product,
-        if (hardware != null) 'hardware': hardware,
-        if (osVersion != null) 'osVersion': osVersion,
         if (platform != null) 'platform': platform,
-        if (sdkInt != null) 'sdkInt': sdkInt,
-        if (isPhysicalDevice != null) 'isPhysicalDevice': isPhysicalDevice,
+        if (osVersion != null) 'osVersion': osVersion,
       };
 
   @override