diff --git a/frontend/mobile-app/lib/core/telemetry/session/session_manager.dart b/frontend/mobile-app/lib/core/telemetry/session/session_manager.dart
index 13014349..8b9ecb19 100644
--- a/frontend/mobile-app/lib/core/telemetry/session/session_manager.dart
+++ b/frontend/mobile-app/lib/core/telemetry/session/session_manager.dart
@@ -95,6 +95,9 @@ class SessionManager with WidgetsBindingObserver {
 
     _state = SessionState.background;
     _endCurrentSession();
+
+    // session_end 写入队列后立即上传，不等待10条阈值
+    _telemetryService?.flushOnBackground();
   }
 
   /// 开始新会话
diff --git a/frontend/mobile-app/lib/core/telemetry/telemetry_service.dart b/frontend/mobile-app/lib/core/telemetry/telemetry_service.dart
index 194ea3e3..a3d8b426 100644
--- a/frontend/mobile-app/lib/core/telemetry/telemetry_service.dart
+++ b/frontend/mobile-app/lib/core/telemetry/telemetry_service.dart
@@ -373,6 +373,12 @@ class TelemetryService {
   /// 获取设备上下文
   DeviceContext? get deviceContext => _deviceContext;
 
+  /// App进入后台时调用：忽略10条阈值，立即上传队列中的事件
+  Future<void> flushOnBackground() async {
+    await _uploader.uploadBatch(batchSize: 50);
+    debugPrint('📊 [Telemetry] Flushed on background');
+  }
+
   /// App退出前调用
   Future<void> dispose() async {
     _configSyncTimer?.cancel();