diff --git a/domain/service/group_mic_s/group_mic.go b/domain/service/group_mic_s/group_mic.go
index e3dc63d8858c654bb5e2c279f35efc33e4effad7..fe600014c4d3fee6938a39913e44d9abde20d691 100644
--- a/domain/service/group_mic_s/group_mic.go
+++ b/domain/service/group_mic_s/group_mic.go
@@ -331,6 +331,7 @@ func (s *GroupMicService) IncrGroupPowerOnMicExpAndTime(groupId string, userId u
 	return nil
 }
 
+// 检查cp上麦
 func (s *GroupMicService) CheckCpOnMic(groupUuid string) {
 	model := domain.CreateModelContext(s.svc.MyContext)
 	// 填充cp麦位
@@ -382,3 +383,43 @@ func (s *GroupMicService) CheckCpOnMic(groupUuid string) {
 	}
 	return
 }
+
+// 检查cp下麦
+func (s *GroupMicService) CheckCpLeaveMic(groupUuid string, leaveUid uint64) {
+	model := domain.CreateModelContext(s.svc.MyContext)
+	// 填充cp麦位
+	micNumType, err := group_m.GetMicNumType(model, groupUuid)
+	if err != nil {
+		return
+	}
+	_, micUsers, err := group_m.GetAllMic(groupUuid, micNumType)
+	if err != nil {
+		return
+	}
+	// userId->micIndex
+	var userMicIndex = make(map[uint64]int)
+	var cpUserId uint64
+	for _, u := range micUsers {
+		if u.UserId == leaveUid {
+			cpUserId = u.CpUserId
+		}
+		userMicIndex[u.UserId] = u.I
+	}
+	if cpUserId <= 0 {
+		return
+	}
+	user, err := user_m.GetUser(model, cpUserId)
+	if err != nil {
+		model.Log.Errorf("GetUser fail:%v", err)
+		return
+	}
+	redisLock(redis_key.GetPrefixGroupMicUserInLock(cpUserId), uuid.NewV4().String(), time.Second*2, func() error {
+		model := domain.CreateModel(s.svc.CtxAndDb)
+		mic, err := group_m.GetMic(model, groupUuid, userMicIndex[cpUserId])
+		if err != nil {
+			return err
+		}
+		return mic.Update(cpUserId, user.ExternalId, 0)
+	})
+	return
+}
diff --git a/route/group_r/group_mic.go b/route/group_r/group_mic.go
index b3c02f2d425dbbedf37fea89705389a6c489bc18..2cb2a728a45f99a274e22c8b046b8de939157928 100644
--- a/route/group_r/group_mic.go
+++ b/route/group_r/group_mic.go
@@ -705,6 +705,8 @@ func GroupMicLeave(c *gin.Context) (*mycontext.MyContext, error) {
 	if err := group_mic_s.NewGroupPowerService(myContext).GroupMicLeave(groupId, i, userId, externalId); err != nil {
 		return myContext, err
 	}
+	// check cp麦位置
+	go group_mic_s.NewGroupPowerService(myContext).CheckCpLeaveMic(groupId, userId)
 	resp.ResponseOk(c, nil)
 	return myContext, nil
 }