diff --git a/client/builders.go b/client/builders.go
index c736d8f5..3a8f9f4a 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -955,6 +955,53 @@ func (c *QQClient) buildGroupAdminSetPacket(groupCode, member int64, flag bool)
 	return seq, packet
 }
 
+// OidbSvc.0x88d_7
+func (c *QQClient) buildGroupInfoRequestPacket(groupCode int64) (uint16, []byte) {
+	seq := c.nextSeq()
+	body := &oidb.D88DReqBody{
+		AppId: proto.Uint32(uint32(SystemDeviceInfo.Protocol)),
+		ReqGroupInfo: []*oidb.ReqGroupInfo{
+			{
+				GroupCode: proto.Uint64(uint64(groupCode)),
+				Stgroupinfo: &oidb.D88DGroupInfo{
+					GroupOwner:           proto.Uint64(0),
+					GroupCreateTime:      proto.Uint32(0),
+					GroupFlag:            proto.Uint32(0),
+					GroupMemberMaxNum:    proto.Uint32(0),
+					GroupMemberNum:       proto.Uint32(0),
+					GroupOption:          proto.Uint32(0),
+					GroupLevel:           proto.Uint32(0),
+					GroupFace:            proto.Uint32(0),
+					GroupName:            EmptyBytes,
+					GroupMemo:            EmptyBytes,
+					GroupFingerMemo:      EmptyBytes,
+					GroupLastMsgTime:     proto.Uint32(0),
+					GroupQuestion:        EmptyBytes,
+					GroupAnswer:          EmptyBytes,
+					GroupGrade:           proto.Uint32(0),
+					ActiveMemberNum:      proto.Uint32(0),
+					HeadPortraitSeq:      proto.Uint32(0),
+					MsgHeadPortrait:      &oidb.D88DGroupHeadPortrait{},
+					StGroupExInfo:        &oidb.D88DGroupExInfoOnly{},
+					GroupSecLevel:        proto.Uint32(0),
+					CmduinPrivilege:      proto.Uint32(0),
+					NoFingerOpenFlag:     proto.Uint32(0),
+					NoCodeFingerOpenFlag: proto.Uint32(0),
+				},
+			},
+		},
+		PcClientVersion: proto.Uint32(0),
+	}
+	b, _ := proto.Marshal(body)
+	req := &oidb.OIDBSSOPkg{
+		Command:    2189,
+		Bodybuffer: b,
+	}
+	payload, _ := proto.Marshal(req)
+	packet := packets.BuildUniPacket(c.Uin, seq, "OidbSvc.0x88d_0", 1, c.OutGoingPacketSessionId, EmptyBytes, c.sigInfo.d2Key, payload)
+	return seq, packet
+}
+
 // MultiMsg.ApplyUp
 func (c *QQClient) buildMultiApplyUpPacket(data, hash []byte, buType int32, groupUin int64) (uint16, []byte) {
 	seq := c.nextSeq()
diff --git a/client/client.go b/client/client.go
index 0bd05d85..48b1569a 100644
--- a/client/client.go
+++ b/client/client.go
@@ -139,6 +139,7 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 			"MultiMsg.ApplyUp":                         decodeMultiApplyUpResponse,
 			"MultiMsg.ApplyDown":                       decodeMultiApplyDownResponse,
 			"OidbSvc.0x6d6_2":                          decodeOIDB6d6Response,
+			"OidbSvc.0x88d_0":                          decodeGroupInfoResponse,
 			"PttCenterSvr.ShortVideoDownReq":           decodePttShortVideoDownResponse,
 		},
 		sigInfo:                &loginSigInfo{},
@@ -308,6 +309,14 @@ func (c *QQClient) GetGroupFileUrl(groupCode int64, fileId string, busId int32)
 	return url
 }
 
+func (c *QQClient) GetGroupInfo(groupCode int64) (*GroupInfo, error) {
+	i, err := c.sendAndWait(c.buildGroupInfoRequestPacket(groupCode))
+	if err != nil {
+		return nil, err
+	}
+	return i.(*GroupInfo), nil
+}
+
 func (c *QQClient) SendGroupMessage(groupCode int64, m *message.SendingMessage, f ...bool) *message.GroupMessage {
 	useFram := false
 	if len(f) > 0 {
@@ -859,9 +868,6 @@ func (c *QQClient) kickGroupMember(groupCode, memberUin int64, msg string) {
 }
 
 func (g *GroupInfo) removeMember(uin int64) {
-	if g.memLock == nil {
-		g.memLock = new(sync.Mutex)
-	}
 	g.memLock.Lock()
 	defer g.memLock.Unlock()
 	for i, m := range g.Members {
diff --git a/client/decoders.go b/client/decoders.go
index 5c4c0290..3c9ba2a3 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -385,6 +385,31 @@ func decodeGroupListResponse(c *QQClient, _ uint16, payload []byte) (interface{}
 	return l, nil
 }
 
+func decodeGroupInfoResponse(c *QQClient, _ uint16, payload []byte) (interface{}, error) {
+	pkg := oidb.OIDBSSOPkg{}
+	rsp := oidb.D88DRspBody{}
+	if err := proto.Unmarshal(payload, &pkg); err != nil {
+		return nil, err
+	}
+	if err := proto.Unmarshal(pkg.Bodybuffer, &rsp); err != nil {
+		return nil, err
+	}
+	if len(rsp.RspGroupInfo) == 0 {
+		return nil, errors.New(string(rsp.StrErrorInfo))
+	}
+	info := rsp.RspGroupInfo[0]
+	return &GroupInfo{
+		Uin:            utils.ToGroupUin(int64(*info.GroupCode)),
+		Code:           int64(*info.GroupCode),
+		Name:           string(info.GroupInfo.GroupName),
+		Memo:           string(info.GroupInfo.GroupMemo),
+		OwnerUin:       int64(*info.GroupInfo.GroupOwner),
+		MemberCount:    uint16(*info.GroupInfo.GroupMemberNum),
+		MaxMemberCount: uint16(*info.GroupInfo.GroupMemberMaxNum),
+		client:         c,
+	}, nil
+}
+
 func decodeGroupMemberListResponse(_ *QQClient, _ uint16, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
diff --git a/client/entities.go b/client/entities.go
index b89489ba..b0b0a698 100644
--- a/client/entities.go
+++ b/client/entities.go
@@ -58,7 +58,7 @@ type (
 		Members        []*GroupMemberInfo
 
 		client  *QQClient
-		memLock *sync.Mutex
+		memLock sync.Mutex
 	}
 
 	GroupMemberInfo struct {