diff --git a/go/chao-sdk-core/Makefile b/go/chao-sdk-core/Makefile
index 57094e1..cdaf84c 100644
--- a/go/chao-sdk-core/Makefile
+++ b/go/chao-sdk-core/Makefile
@@ -100,8 +100,9 @@ else
 endif
 
 # Copy githook scripts when execute makefile
+# NEED Remove. DON'T REJECT!!
 # TODO! GIT_FILE_SIZE_LIMIT=42000000 git commit -m "This commit is allowed file sizes up to 42MB"
-COPY_GITHOOK:=$(shell cp -f scripts/githooks/* .git/hooks/; chmod +x .git/hooks/*)
+# COPY_GITHOOK:=$(shell cp -f scripts/githooks/* .git/hooks/; chmod +x .git/hooks/*)
 
 # Linux command settings
 FIND := find . ! -path './image/*' ! -path './vendor/*' ! -path './bin/*'
diff --git a/go/chao-sdk-core/internal/cache/cahe.go b/go/chao-sdk-core/internal/cache/cache.go
similarity index 100%
rename from go/chao-sdk-core/internal/cache/cahe.go
rename to go/chao-sdk-core/internal/cache/cache.go
diff --git a/go/chao-sdk-core/internal/conversation_msg/message_controller.go b/go/chao-sdk-core/internal/conversation_msg/message_controller.go
index 3b413e9..bf8f79d 100644
--- a/go/chao-sdk-core/internal/conversation_msg/message_controller.go
+++ b/go/chao-sdk-core/internal/conversation_msg/message_controller.go
@@ -70,6 +70,7 @@ func (m *MessageController) BatchUpdateMessageList(ctx context.Context, updateMs
 				latestMsg.ServerMsgID = v.ServerMsgID
 				latestMsg.Seq = v.Seq
 				latestMsg.SendTime = v.SendTime
+				latestMsg.Status = v.Status
 				conversation.LatestMsg = utils.StructToJsonString(latestMsg)
 				_ = common.TriggerCmdUpdateConversation(ctx, common.UpdateConNode{ConID: conversation.ConversationID,
 					Action: constant.AddConOrUpLatMsg, Args: *conversation}, m.ch)
diff --git a/go/chao-sdk-core/internal/conversation_msg/sdk.go b/go/chao-sdk-core/internal/conversation_msg/sdk.go
index cb0d062..6a2321d 100644
--- a/go/chao-sdk-core/internal/conversation_msg/sdk.go
+++ b/go/chao-sdk-core/internal/conversation_msg/sdk.go
@@ -1034,7 +1034,26 @@ func (c *Conversation) SearchLocalMessages(ctx context.Context, searchParam *sdk
 
 }
 func (c *Conversation) SetMessageLocalEx(ctx context.Context, conversationID string, clientMsgID string, localEx string) error {
-	return c.db.UpdateColumnsMessage(ctx, conversationID, clientMsgID, map[string]interface{}{"local_ex": localEx})
+	err := c.db.UpdateColumnsMessage(ctx, conversationID, clientMsgID, map[string]interface{}{"local_ex": localEx})
+	if err != nil {
+		return err
+	}
+	conversation, err := c.db.GetConversation(ctx, conversationID)
+	if err != nil {
+		return err
+	}
+	var latestMsg sdk_struct.MsgStruct
+	utils.JsonStringToStruct(conversation.LatestMsg, &latestMsg)
+	if latestMsg.ClientMsgID == clientMsgID {
+		log.ZDebug(ctx, "latestMsg local ex changed", "seq", latestMsg.Seq, "clientMsgID", latestMsg.ClientMsgID)
+		latestMsg.LocalEx = localEx
+		latestMsgStr := utils.StructToJsonString(latestMsg)
+		if err = c.db.UpdateColumnsConversation(ctx, conversationID, map[string]interface{}{"latest_msg": latestMsgStr, "latest_msg_send_time": latestMsg.SendTime}); err != nil {
+			return err
+		}
+		c.doUpdateConversation(common.Cmd2Value{Value: common.UpdateConNode{Action: constant.ConChange, Args: []string{conversationID}}})
+	}
+	return nil
 }
 
 func (c *Conversation) initBasicInfo(ctx context.Context, message *sdk_struct.MsgStruct, msgFrom, contentType int32) error {
diff --git a/go/chao-sdk-core/internal/group/sdk.go b/go/chao-sdk-core/internal/group/sdk.go
index f67677d..1e72bf7 100644
--- a/go/chao-sdk-core/internal/group/sdk.go
+++ b/go/chao-sdk-core/internal/group/sdk.go
@@ -352,17 +352,16 @@ func (g *Group) SearchGroupMembers(ctx context.Context, searchParam *sdk_params_
 }
 
 func (g *Group) IsJoinGroup(ctx context.Context, groupID string) (bool, error) {
-	groupList, err := g.db.GetJoinedGroupListDB(ctx)
+	groupIDs, err := g.db.GetVersionSync(ctx, g.groupTableName(), g.loginUserID)
 	if err != nil {
 		return false, err
 	}
-	for _, localGroup := range groupList {
-		if localGroup.GroupID == groupID {
-			return true, nil
-		}
+	if datautil.Contain(groupID, groupIDs.UIDList...) {
+		return true, nil
 	}
 	return false, nil
 }
+
 func (g *Group) InviteUserToGroup(ctx context.Context, groupID, reason string, userIDList []string) error {
 	if err := util.ApiPost(ctx, constant.InviteUserToGroupRouter, &group.InviteUserToGroupReq{GroupID: groupID, Reason: reason, InvitedUserIDs: userIDList}, nil); err != nil {
 		return err
diff --git a/go/chao-sdk-core/internal/interaction/msg_sync.go b/go/chao-sdk-core/internal/interaction/msg_sync.go
index 58f9a50..4f28dec 100644
--- a/go/chao-sdk-core/internal/interaction/msg_sync.go
+++ b/go/chao-sdk-core/internal/interaction/msg_sync.go
@@ -16,8 +16,11 @@ package interaction
 
 import (
 	"context"
-	"github.com/openimsdk/openim-sdk-core/v3/pkg/db/model_struct"
 	"strings"
+	"sync"
+	"time"
+
+	"github.com/openimsdk/openim-sdk-core/v3/pkg/db/model_struct"
 
 	"github.com/openimsdk/openim-sdk-core/v3/pkg/common"
 	"github.com/openimsdk/openim-sdk-core/v3/pkg/constant"
@@ -78,15 +81,51 @@ func (m *MsgSyncer) loadSeq(ctx context.Context) error {
 	if len(conversationIDList) == 0 {
 		m.reinstalled = true
 	}
-	//TODO With a large number of sessions, this could potentially cause blocking and needs optimization.
+
+	// TODO With a large number of sessions, this could potentially cause blocking and needs optimization.
+	type SyncedSeq struct {
+		ConversationID string
+		MaxSyncedSeq   int64
+		Err            error
+	}
+	concurrency := 10
+	t2 := time.Now()
+	SyncedSeqs := make(chan SyncedSeq, len(conversationIDList))
+	sem := make(chan struct{}, concurrency)
+
+	var wg sync.WaitGroup
 	for _, v := range conversationIDList {
-		maxSyncedSeq, err := m.db.GetConversationNormalMsgSeq(ctx, v)
-		if err != nil {
-			log.ZError(ctx, "get group normal seq failed", err, "conversationID", v)
+		wg.Add(1)
+		sem <- struct{}{} // Acquire a token
+		go func(conversationID string) {
+			defer wg.Done()
+			defer func() { <-sem }() // Release the token
+
+			maxSyncedSeq, err := m.db.GetConversationNormalMsgSeq(ctx, conversationID)
+			SyncedSeqs <- SyncedSeq{
+				ConversationID: conversationID,
+				MaxSyncedSeq:   maxSyncedSeq,
+				Err:            err,
+			}
+		}(v)
+		log.ZDebug(ctx, "goroutine done.", "goroutine cost time", time.Since(t2))
+	}
+
+	// Close the results channel once all goroutines have finished
+	go func() {
+		wg.Wait()
+		close(SyncedSeqs)
+	}()
+
+	// Collect the results
+	for res := range SyncedSeqs {
+		if res.Err != nil {
+			log.ZError(ctx, "get group normal seq failed", res.Err, "conversationID", res.ConversationID)
 		} else {
-			m.syncedMaxSeqs[v] = maxSyncedSeq
+			m.syncedMaxSeqs[res.ConversationID] = res.MaxSyncedSeq
 		}
 	}
+
 	notificationSeqs, err := m.db.GetNotificationAllSeqs(ctx)
 	if err != nil {
 		log.ZError(ctx, "get notification seq failed", err)
@@ -246,7 +285,7 @@ func (m *MsgSyncer) doConnected(ctx context.Context) {
 		common.TriggerCmdNotification(m.ctx, sdk_struct.CmdNewMsgComeToConversation{SyncFlag: constant.MsgSyncFailed}, m.conversationCh)
 		return
 	} else {
-		log.ZDebug(m.ctx, "get max seq success", "resp", resp)
+		log.ZDebug(m.ctx, "get max seq success", "resp", resp.MaxSeqs)
 	}
 	m.compareSeqsAndBatchSync(ctx, resp.MaxSeqs, connectPullNums)
 	if reinstalled {
diff --git a/go/chao-sdk-core/testv2/conversation_test.go b/go/chao-sdk-core/testv2/conversation_test.go
index 9d925bb..27c85fe 100644
--- a/go/chao-sdk-core/testv2/conversation_test.go
+++ b/go/chao-sdk-core/testv2/conversation_test.go
@@ -216,22 +216,12 @@ func Test_SearchLocalMessages(t *testing.T) {
 	}
 }
 
-// // delete
-// funcation Test_DeleteMessageFromLocalStorage(t *testing.T) {
-//	err := open_im_sdk.UserForSDK.Conversation().DeleteMessageFromLocalStorage(ctx, &sdk_struct.MsgStruct{SessionType: 1, ContentType: 1203,
-//		ClientMsgID: "ef02943b05b02d02f92b0e92516099a3", Seq: 31, SendID: "kernaltestuid8", RecvID: "kernaltestuid9"})
-//	if err != nil {
-//		t.Fatal(err)
-//	}
-// }
-//
-// funcation Test_DeleteMessage(t *testing.T) {
-//	err := open_im_sdk.UserForSDK.Conversation().DeleteMessage(ctx, &sdk_struct.MsgStruct{SessionType: 1, ContentType: 1203,
-//		ClientMsgID: "ef02943b05b02d02f92b0e92516099a3", Seq: 31, SendID: "kernaltestuid8", RecvID: "kernaltestuid9"})
-//	if err != nil {
-//		t.Fatal(err)
-//	}
-// }
+func Test_SetMessageLocalEx(t *testing.T) {
+	err := open_im_sdk.UserForSDK.Conversation().SetMessageLocalEx(ctx, "si_2975755104_6386894923", "53ca4b3be29f7ea231a5e82e7af8a43f", "{key,value}")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
 
 func Test_DeleteAllMsgFromLocalAndSvr(t *testing.T) {
 	err := open_im_sdk.UserForSDK.Conversation().DeleteAllMsgFromLocalAndSvr(ctx)