diff --git a/src/CncService/Impl/DashboardService.cs b/src/CncService/Impl/DashboardService.cs
index 9258443..0402ff5 100644
--- a/src/CncService/Impl/DashboardService.cs
+++ b/src/CncService/Impl/DashboardService.cs
@@ -73,8 +73,26 @@ namespace CncService.Impl
         public object GetCollectorStatus()
         {
             var latest = _collectorHeartbeatRepository.GetLatest("collector-service");
-            bool isRunning = latest != null && latest.Status == "running";
-            long uptimeSeconds = isRunning ? (latest.UptimeSeconds ?? 0) : 0;
+
+            // 心跳超时阈值：90秒（3个心跳间隔，采集服务默认每30秒上报一次）
+            const int heartbeatTimeoutSeconds = 90;
+
+            bool isRunning = false;
+            long uptimeSeconds = 0;
+
+            if (latest != null && latest.Status == "running")
+            {
+                // 检查最后心跳时间是否在阈值内，超时则判定为已停止
+                var lastHeartbeat = latest.CreatedAt;
+                var elapsed = (DateTime.Now - lastHeartbeat).TotalSeconds;
+                isRunning = elapsed <= heartbeatTimeoutSeconds;
+
+                if (isRunning)
+                {
+                    uptimeSeconds = latest.UptimeSeconds ?? 0;
+                }
+            }
+
             return new { status = isRunning ? "running" : "stopped", uptimeSeconds, lastCollectTime = latest?.LastCollectTime };
         }
     }