diff --git a/internal/cron_task/clear_msg.go b/internal/cron_task/clear_msg.go
index f6ea7cd1f..5ae3b16c6 100644
--- a/internal/cron_task/clear_msg.go
+++ b/internal/cron_task/clear_msg.go
@@ -100,13 +100,13 @@ func deleteMongoMsg(operationID string, ID string, index int64, delStruct *delMs
 		if err != nil {
 			return 0, err
 		}
-		return delStruct.getSetMinSeq() + 1, nil
+		return delStruct.getSetMinSeq(), nil
 	}
 	log.NewDebug(operationID, "ID:", ID, "index:", index, "uid:", msgs.UID, "len:", len(msgs.Msg))
 	if len(msgs.Msg) > db.GetSingleGocMsgNum() {
 		log.NewWarn(operationID, utils.GetSelfFuncName(), "msgs too large", len(msgs.Msg), msgs.UID)
 	}
-	if msgs.Msg[len(msgs.Msg)-1].SendTime+(int64(config.Config.Mongo.DBRetainChatRecords)*24*60*60*1000) > utils.GetCurrentTimestampByMill() && msgListIsFull(msgs) {
+	if msgs.Msg[len(msgs.Msg)-1].SendTime+(int64(config.Config.Mongo.DBRetainChatRecords)*24*60*60*1000) < utils.GetCurrentTimestampByMill() && msgListIsFull(msgs) {
 		delStruct.delUidList = append(delStruct.delUidList, msgs.UID)
 		lastMsgPb := &server_api_params.MsgData{}
 		err = proto.Unmarshal(msgs.Msg[len(msgs.Msg)-1].Msg, lastMsgPb)
@@ -114,7 +114,8 @@ func deleteMongoMsg(operationID string, ID string, index int64, delStruct *delMs
 			log.NewError(operationID, utils.GetSelfFuncName(), err.Error(), len(msgs.Msg)-1, msgs.UID)
 			return 0, utils.Wrap(err, "proto.Unmarshal failed")
 		}
-		delStruct.minSeq = lastMsgPb.Seq
+		delStruct.minSeq = lastMsgPb.Seq + 1
+		log.NewDebug(operationID, utils.GetSelfFuncName(), msgs.UID, "add to delUidList", "minSeq", lastMsgPb.Seq+1)
 	} else {
 		var hasMarkDelFlag bool
 		for index, msg := range msgs.Msg {
@@ -124,7 +125,7 @@ func deleteMongoMsg(operationID string, ID string, index int64, delStruct *delMs
 				log.NewError(operationID, utils.GetSelfFuncName(), err.Error(), len(msgs.Msg)-1, msgs.UID)
 				return 0, utils.Wrap(err, "proto.Unmarshal failed")
 			}
-			if utils.GetCurrentTimestampByMill() > msg.SendTime+(int64(config.Config.Mongo.DBRetainChatRecords)*24*60*60*1000) && msg.SendTime != 0 {
+			if utils.GetCurrentTimestampByMill() > msg.SendTime+(int64(config.Config.Mongo.DBRetainChatRecords)*24*60*60*1000) {
 				msgPb.Status = constant.MsgDeleted
 				bytes, _ := proto.Marshal(msgPb)
 				msgs.Msg[index].Msg = bytes
diff --git a/internal/cron_task/clear_msg_test.go b/internal/cron_task/clear_msg_test.go
index 87d735438..627ba1431 100644
--- a/internal/cron_task/clear_msg_test.go
+++ b/internal/cron_task/clear_msg_test.go
@@ -84,13 +84,12 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 	client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(mongoUri))
 	mongoClient = client.Database("openIM").Collection("msg")
 	testUID1 := "test_del_id1"
-	//testUID2 := "test_del_id2"
-	//testUID3 := "test_del_id3"
+
 	//testUID4 := "test_del_id4"
 	//testUID5 := "test_del_id5"
 	//testUID6 := "test_del_id6"
 	err = SetUserMaxSeq(testUID1, 600)
-	userChat := GenUserChat(1, 500, 200, 0, testUID1)
+	userChat := GenUserChat(1, 600, 200, 0, testUID1)
 	err = CreateChat(userChat)
 	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID1); err != nil {
 		t.Error("checkMaxSeqWithMongo failed", testUID1)
@@ -103,6 +102,66 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 		t.Error("err is not nil", testUID1, err.Error())
 	}
 	if minSeq != 201 {
-		t.Error("is not the same", "minSeq:", minSeq, "targetSeq", 201)
+		t.Error("test1 is not the same", "minSeq:", minSeq, "targetSeq", 201)
+	}
+
+	testUID2 := "test_del_id2"
+	err = SetUserMaxSeq(testUID2, 7000)
+	userChat = GenUserChat(1, 4999, 5000, 0, testUID2)
+	userChat2 := GenUserChat(5000, 7000, 6000, 1, testUID2)
+	err = CreateChat(userChat)
+	err = CreateChat(userChat2)
+	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID2); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID2)
+	}
+	if err := checkMaxSeqWithMongo(operationID, testUID2, constant.WriteDiffusion); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID2)
+	}
+	minSeq, err = GetUserMinSeq(testUID2)
+	if err != nil {
+		t.Error("err is not nil", testUID2, err.Error())
+	}
+	if minSeq != 6001 {
+		t.Error("test2 is not the same", "minSeq:", minSeq, "targetSeq", 6001)
+	}
+
+	testUID3 := "test_del_id3"
+	err = SetUserMaxSeq(testUID3, 4999)
+	userChat = GenUserChat(1, 4999, 5000, 0, testUID3)
+	err = CreateChat(userChat)
+	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID3); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID3)
+	}
+	if err := checkMaxSeqWithMongo(operationID, testUID3, constant.WriteDiffusion); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID3)
+	}
+	minSeq, err = GetUserMinSeq(testUID3)
+	if err != nil {
+		t.Error("err is not nil", testUID3, err.Error())
+	}
+	if minSeq != 5000 {
+		t.Error("test3 is not the same", "minSeq:", minSeq, "targetSeq", 5000)
+	}
+
+	testUID4 := "test_del_id4"
+	err = SetUserMaxSeq(testUID4, 12000)
+	userChat = GenUserChat(1, 4999, 5000, 0, testUID4)
+	userChat2 = GenUserChat(5000, 9999, 10000, 1, testUID4)
+	userChat3 := GenUserChat(10000, 12000, 11000, 2, testUID4)
+	err = CreateChat(userChat)
+	err = CreateChat(userChat2)
+	err = CreateChat(userChat3)
+	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID4); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID4)
+	}
+	if err := checkMaxSeqWithMongo(operationID, testUID4, constant.WriteDiffusion); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID4)
+	}
+	minSeq, err = GetUserMinSeq(testUID4)
+	if err != nil {
+		t.Error("err is not nil", testUID4, err.Error())
+	}
+	if minSeq != 11001 {
+		t.Error("test3 is not the same", "minSeq:", minSeq, "targetSeq", 11001)
 	}
 }