diff --git a/CommandHandler.cs b/CommandHandler.cs
index 584bb07..34c992d 100644
--- a/CommandHandler.cs
+++ b/CommandHandler.cs
@@ -16,6 +16,10 @@ namespace DualScreenDemo
         public static bool readyForSongListInput = false;
         private readonly int _maxHistoryLength = 6; // 最多保留 6 筆
         private readonly Queue<string> _indataHistory = new Queue<string>();
+
+        private int _wrongInputCountfor62 = 0; // 錯誤輸入計數器
+        private int _wrongInputCountfor61 = 0; // 錯誤輸入計數器
+        private const int MaxWrongLimit = 3; // 錯誤輸入限制次數
         private readonly SongListManager songListManager;
 
         public CommandHandler(SongListManager songListManager)
@@ -336,7 +340,16 @@ namespace DualScreenDemo
                         else
                         {
                             ClearDisplay();
-                            OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                            _wrongInputCountfor61++;
+                            if(_wrongInputCountfor61 <= MaxWrongLimit)
+                            {
+                                OverlayForm.MainForm.displayLabel.Text += "#";
+                            }
+                            else
+                            {
+                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                                _wrongInputCountfor61 = 0; // 重置計數器
+                            }
                             OverlayForm.MainForm.nextSongLabel.Visible = false;
                             OverlayForm.displayTimer.Start();
                         }
@@ -355,7 +368,16 @@ namespace DualScreenDemo
                     else
                     {
                         ClearDisplay();
-                        OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                        _wrongInputCountfor61++;
+                        if(_wrongInputCountfor61 <= MaxWrongLimit)
+                        {
+                            OverlayForm.MainForm.displayLabel.Text += "#";
+                        }
+                        else
+                        {
+                            OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                            _wrongInputCountfor61 = 0; // 重置計數器
+                        }
                         OverlayForm.MainForm.nextSongLabel.Visible = false;
                         OverlayForm.displayTimer.Start();
                     }
@@ -408,7 +430,16 @@ namespace DualScreenDemo
                         else
                         {
                             ClearDisplay();
-                            OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                            _wrongInputCountfor62++;
+                            if(_wrongInputCountfor62 <= MaxWrongLimit)
+                            {
+                                OverlayForm.MainForm.displayLabel.Text += "*";
+                            }
+                            else
+                            {
+                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                                _wrongInputCountfor62 = 0; // 重置計數器
+                            }
                             OverlayForm.MainForm.nextSongLabel.Visible = false;
                             OverlayForm.displayTimer.Start();
                         }
@@ -425,7 +456,16 @@ namespace DualScreenDemo
                     else
                     {
                         ClearDisplay();
-                        OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                        _wrongInputCountfor62++;
+                        if(_wrongInputCountfor62 <= MaxWrongLimit)
+                        {
+                            OverlayForm.MainForm.displayLabel.Text += "*";
+                        }
+                        else
+                        {
+                            OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                            _wrongInputCountfor62 = 0; // 重置計數器
+                        }
                         OverlayForm.MainForm.nextSongLabel.Visible = false;
                         OverlayForm.displayTimer.Start();
                     }