diff --git a/internal/msg_transfer/logic/db.go b/internal/msg_transfer/logic/db.go
index edc269f9f..806b782c0 100644
--- a/internal/msg_transfer/logic/db.go
+++ b/internal/msg_transfer/logic/db.go
@@ -18,6 +18,6 @@ func saveUserChat(uid string, msg *pbMsg.MsgDataToMQ) error {
 	pbSaveData := pbMsg.MsgDataToDB{}
 	pbSaveData.MsgData = msg.MsgData
 	log.NewInfo(msg.OperationID, "IncrUserSeq cost time", utils.GetCurrentTimestampByMill()-time)
-	return db.DB.SaveUserChat(uid, pbSaveData.MsgData.SendTime, &pbSaveData)
+	return db.DB.SaveUserChatMongo2(uid, pbSaveData.MsgData.SendTime, &pbSaveData)
 //	return db.DB.SaveUserChatMongo2(uid, pbSaveData.MsgData.SendTime, &pbSaveData)
 }
diff --git a/internal/rpc/msg/pull_message.go b/internal/rpc/msg/pull_message.go
index 126c6eb29..10a0978aa 100644
--- a/internal/rpc/msg/pull_message.go
+++ b/internal/rpc/msg/pull_message.go
@@ -39,8 +39,8 @@ func (rpc *rpcChat) GetMaxAndMinSeq(_ context.Context, in *pbMsg.GetMaxAndMinSeq
 func (rpc *rpcChat) PullMessageBySeqList(_ context.Context, in *open_im_sdk.PullMessageBySeqListReq) (*open_im_sdk.PullMessageBySeqListResp, error) {
 	log.NewInfo(in.OperationID, "rpc PullMessageBySeqList is arriving", in.String())
 	resp := new(open_im_sdk.PullMessageBySeqListResp)
-	msgList, err := commonDB.DB.GetMsgBySeqList(in.UserID, in.SeqList, in.OperationID)
-//	msgList, err := commonDB.DB.GetMsgBySeqListMongo2(in.UserID, in.SeqList, in.OperationID)
+	//msgList, err := commonDB.DB.GetMsgBySeqList(in.UserID, in.SeqList, in.OperationID)
+	msgList, err := commonDB.DB.GetMsgBySeqListMongo2(in.UserID, in.SeqList, in.OperationID)
 	if err != nil {
 		log.ErrorByKv("PullMessageBySeqList data error", in.OperationID, in.String())
 		resp.ErrCode = 201
diff --git a/internal/timed_task/timed_task.go b/internal/timed_task/timed_task.go
index bda907ea7..5b0264123 100644
--- a/internal/timed_task/timed_task.go
+++ b/internal/timed_task/timed_task.go
@@ -17,7 +17,7 @@ func (t *TimeTask) timedDeleteUserChat() {
 	for i := 0; i < count; i++ {
 		time.Sleep(10 * time.Millisecond)
 		uid, _ := db.DB.MgoSkipUID(i)
-		db.DB.DelUserChat(uid)
+		db.DB.DelUserChatMongo2(uid)
 	}
 
 	go func() {
diff --git a/pkg/common/db/model.go b/pkg/common/db/model.go
index f990d95a3..8511201fa 100644
--- a/pkg/common/db/model.go
+++ b/pkg/common/db/model.go
@@ -3,15 +3,15 @@ package db
 import (
 	"Open_IM/pkg/common/config"
 	"Open_IM/pkg/common/log"
-//	"context"
-//	"fmt"
+	//	"context"
+	//	"fmt"
 	"github.com/garyburd/redigo/redis"
 	"gopkg.in/mgo.v2"
 	"time"
 
 	//"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
-//	"go.mongodb.org/mongo-driver/mongo/options"
+	//	"go.mongodb.org/mongo-driver/mongo/options"
 
 )
 
@@ -36,7 +36,7 @@ func init() {
 	initMysqlDB()
 	// mongo init
 	// "mongodb://sysop:moon@localhost/records"
-	// uri := "mongodb://user:pass@sample.host:27017/?maxPoolSize=20&w=majority"
+	//uri := "mongodb://user:pass@sample.host:27017/?maxPoolSize=20&w=majority"
 	//uri := fmt.Sprintf("mongodb://%s:%s@%s/%s/?maxPoolSize=%d",
 	//	config.Config.Mongo.DBUserName, config.Config.Mongo.DBPassword,
 	//	config.Config.Mongo.DBAddress[0],config.Config.Mongo.DBDatabase,
diff --git a/pkg/common/db/mongoModel.go b/pkg/common/db/mongoModel.go
index 7a9c4b302..3b489af23 100644
--- a/pkg/common/db/mongoModel.go
+++ b/pkg/common/db/mongoModel.go
@@ -65,7 +65,12 @@ func (d *DataBases) GetMinSeqFromMongo(uid string) (MinSeq uint32, err error) {
 	//return MinSeq, nil
 }
 
+func (d *DataBases) GetMinSeqFromMongo2(uid string) (MinSeq uint32, err error) {
+	return 1, nil
+}
+
 func (d *DataBases) GetMsgBySeqList(uid string, seqList []uint32, operationID string) (seqMsg []*open_im_sdk.MsgData, err error) {
+	log.NewInfo(operationID, utils.GetSelfFuncName(), uid, seqList)
 	var hasSeqList []uint32
 	singleCount := 0
 	session := d.mgoSession.Clone()