diff --git a/Global/Global.c b/Global/Global.c
index 113b8b2..fb9dcaf 100644
--- a/Global/Global.c
+++ b/Global/Global.c
@@ -716,6 +716,17 @@ void Pick_Handle()
 {
   uint8_t midi = 0;
   uint8_t midi_note_buff[4] = {0,};
+  uint8_t note_cnt = 0;
+  uint8_t chord_id = KEY_ID_1629;
+
+  /* 左手未触发和弦板（或落在拍速/停止键）时：拨片默认发当前调一级大和弦伴奏 */
+  if (chord_id == 0 || chord_id == 22 || chord_id == 23)
+  {
+    KEY_ID_1629 = 1;
+    chord_type_index_map[1].type = 0;
+    chord_id = 1;
+  }
+  note_cnt = GetChordNotesByType(chord_id, chord_type_index_map[chord_id].type, midi_note_buff);
   Return_Light_buff(KEY_ID_1629);
 
   switch(mGuiData[GUI_TAB_INDEX].Current)
@@ -730,24 +741,24 @@ void Pick_Handle()
                 AutoBandTop1_SetLoopMode(0,1);
                 midi = 0x3C + mGuiData[GUI_TRANSPOSE].Current;
                 AutoBandTop1_StartWithNote(midi);
-                AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+                AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
             }
           break;
           case 1:
              StartFlag = 1;
              AutoBandTop1_SetPiecePlayMode(1,0,1920);
-             AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+             AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
              AutoBandTop1_SetLoopMode(0,1);
           break;
           case 0:
              if(PressFlag)
              {
                  AutoBandTop1_SetLoopMode(0,1);
-                 AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+                 AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
              }else
              {
                  AutoBandTop1_SetPiecePlayMode(1,0,480);
-                 AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+                 AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
              }
              StartFlag = 1;
           break;
@@ -761,14 +772,14 @@ void Pick_Handle()
               AutoBandTop1_SetLoopMode(0,1);
               midi = 0x3C + mGuiData[GUI_TRANSPOSE].Current;
               AutoBandTop1_StartWithNote(midi);
-              AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+              AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
           }
       break;
 
-      case 1:  
+      case 1:
          StartFlag = 1;
          AutoBandTop1_SetPiecePlayMode(1,0,1920);
-         AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+         AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
          AutoBandTop1_SetLoopMode(0,1);
       break;
       case 0:
@@ -776,12 +787,12 @@ void Pick_Handle()
          if(PressFlag)
          {
              AutoBandTop1_SetPiecePlayMode(1,0,480);
-             AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+             AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
              AutoBandTop1_SetLoopMode(0,1);
          }else
          {
              AutoBandTop1_SetPiecePlayMode(1,0,480);
-             AutoBandTop1_StartWithNotes(midi_note_buff,GetChordNotesByType(KEY_ID_1629,chord_type_index_map[KEY_ID_1629].type,midi_note_buff));
+             AutoBandTop1_StartWithNotes(midi_note_buff, note_cnt);
          }
       break;
     }