diff --git a/UIShare/GlobalVariable/DeviceHealthMonitor.cs b/UIShare/GlobalVariable/DeviceHealthMonitor.cs
index 573610e..b95d497 100644
--- a/UIShare/GlobalVariable/DeviceHealthMonitor.cs
+++ b/UIShare/GlobalVariable/DeviceHealthMonitor.cs
@@ -7,6 +7,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Windows;
 
 namespace UIShare.GlobalVariable
 {
@@ -221,17 +222,27 @@ namespace UIShare.GlobalVariable
         }
 
         /// <summary>
-        /// 同步更新 SystemConfig.DeviceList 中对应设备的 IsConnected 状态（驱动 UI 刷新）
+        /// 通过 UI 线程更新 SystemConfig.DeviceList 中对应设备的 IsConnected 状态（驱动 UI 刷新）。
+        /// <para>Timer 回调运行在线程池线程上，必须切回 UI 线程才能触发 PropertyChanged。</para>
         /// </summary>
         private void UpdateDeviceInfoState(string deviceName, bool isConnected)
         {
             var info = _systemConfig?.DeviceList?
                 .FirstOrDefault(d => d != null &&
                     string.Equals(d.DeviceName, deviceName, StringComparison.OrdinalIgnoreCase));
-            if (info != null)
+            if (info == null) return;
+
+            var dispatcher = Application.Current?.Dispatcher;
+            if (dispatcher == null || dispatcher.CheckAccess())
             {
+                // 已在 UI 线程（或无 Dispatcher），直接赋值
                 info.IsConnected = isConnected;
             }
+            else
+            {
+                // 切回 UI 线程赋值，避免跨线程 PropertyChanged 异常
+                dispatcher.BeginInvoke(() => info.IsConnected = isConnected);
+            }
         }
 
         public void Dispose()