diff --git a/application/api/model/RoomPit.php b/application/api/model/RoomPit.php
index aa98070..9ef0a7d 100644
--- a/application/api/model/RoomPit.php
+++ b/application/api/model/RoomPit.php
@@ -270,6 +270,10 @@ class RoomPit extends Model
 
             //换麦使用
             if(isset($pit_infos) && $pit_infos['pit_number'] > 0){
+                //9号麦位不允许换
+                if($pit_infos['pit_number'] == 9){
+                    return ['code' => 0, 'msg' => 'PK中 主持不允许换麦', 'data' => null];
+                }
                 $exchange1 = db::name('vs_room_pit')->where(['room_id' => $room_id, 'pit_number' => $pit_infos['pit_number']])->update([ 'user_id' => 0]);
                 $exchange = db::name('vs_room_pit')->where(['room_id' => $room_id, 'pit_number' => $pit_number])->update([ 'user_id' => $user_id]);
                 if(!$exchange || !$exchange1){