diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
index ac931ce..4782b9c 100644
--- a/MainWindow.xaml.cs
+++ b/MainWindow.xaml.cs
@@ -292,11 +292,31 @@ public partial class MainWindow : Window
     {
         if (HistoryList.SelectedItem is not GotifyMessage msg) return;
         var text = BuildFullMessageText(msg);
-        try
+
+        // 剪贴板常被其他进程占着(RDP、杀软、其他复制操作),CLIPBRD_E_CANT_OPEN 是常见 race。
+        // Clipboard.SetText 不自带重试,自己包一层:最多 10 次,每次等 50ms。
+        const int MaxAttempts = 10;
+        const int DelayMs = 50;
+        Exception? lastEx = null;
+        bool ok = false;
+        for (int attempt = 1; attempt <= MaxAttempts; attempt++)
+        {
+            try
+            {
+                Clipboard.SetText(text);
+                ok = true;
+                break;
+            }
+            catch (System.Runtime.InteropServices.COMException ex)
+            {
+                lastEx = ex;
+                System.Threading.Thread.Sleep(DelayMs);
+            }
+        }
+
+        if (ok)
         {
-            Clipboard.SetText(text);
             _logger?.Info($"Copied message to clipboard. id={msg.Id}");
-            // 按钮反馈:短暂显示「已复制 ✓」
             if (sender is Button btn)
             {
                 var origContent = btn.Content;
@@ -313,11 +333,12 @@ public partial class MainWindow : Window
                 timer.Start();
             }
         }
-        catch (Exception ex)
+        else
         {
-            _logger?.Error("Copy to clipboard failed.", ex);
-            MessageBox.Show($"复制失败:{ex.Message}", "Windows Gotify",
-                MessageBoxButton.OK, MessageBoxImage.Warning);
+            _logger?.Error("Copy to clipboard failed after retries.", lastEx);
+            MessageBox.Show(
+                $"复制失败:剪贴板被其他程序占用,重试 {MaxAttempts} 次仍未成功。\n请关闭正在使用剪贴板的程序后重试。\n\n错误:0x{(lastEx?.HResult ?? 0):X8}",
+                "Windows Gotify", MessageBoxButton.OK, MessageBoxImage.Warning);
         }
     }