diff --git a/client/builders.go b/client/builders.go
index 3a8f9f4a..2cc3700a 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -965,6 +965,7 @@ func (c *QQClient) buildGroupInfoRequestPacket(groupCode int64) (uint16, []byte)
 				GroupCode: proto.Uint64(uint64(groupCode)),
 				Stgroupinfo: &oidb.D88DGroupInfo{
 					GroupOwner:           proto.Uint64(0),
+					GroupUin:             proto.Uint64(0),
 					GroupCreateTime:      proto.Uint32(0),
 					GroupFlag:            proto.Uint32(0),
 					GroupMemberMaxNum:    proto.Uint32(0),
diff --git a/client/decoders.go b/client/decoders.go
index bb88c3fe..6d5d569a 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -291,7 +291,7 @@ func decodeGroupMessagePacket(c *QQClient, _ uint16, payload []byte) (interface{
 		return nil, nil
 	}
 	if pkt.Message.Content != nil && pkt.Message.Content.PkgNum > 1 {
-		var builder *groupMessageBuilder
+		var builder *groupMessageBuilder // TODO: 支持多SEQ
 		i, ok := c.groupMsgBuilders.Load(pkt.Message.Content.DivSeq)
 		if !ok {
 			builder = &groupMessageBuilder{
@@ -403,7 +403,7 @@ func decodeGroupInfoResponse(c *QQClient, _ uint16, payload []byte) (interface{}
 	}
 	info := rsp.RspGroupInfo[0]
 	return &GroupInfo{
-		Uin:            utils.ToGroupUin(int64(*info.GroupCode)),
+		Uin:            int64(*info.GroupInfo.GroupUin),
 		Code:           int64(*info.GroupCode),
 		Name:           string(info.GroupInfo.GroupName),
 		Memo:           string(info.GroupInfo.GroupMemo),
diff --git a/client/global.go b/client/global.go
index 8d58060f..beef55d0 100644
--- a/client/global.go
+++ b/client/global.go
@@ -267,7 +267,22 @@ func (c *QQClient) parseTempMessage(msg *msg.Message) *message.TempMessage {
 func (c *QQClient) parseGroupMessage(m *msg.Message) *message.GroupMessage {
 	group := c.FindGroup(m.Head.GroupInfo.GroupCode)
 	if group == nil {
-		return nil
+		c.Debug("sync group %v.", m.Head.GroupInfo.GroupCode)
+		info, err := c.GetGroupInfo(m.Head.GroupInfo.GroupCode)
+		if err != nil {
+			c.Error("error to sync group %v : %v", m.Head.GroupInfo.GroupCode, err)
+			return nil
+		}
+		group = info
+		c.GroupList = append(c.GroupList, info)
+	}
+	if len(group.Members) == 0 {
+		mem, err := c.GetGroupMembers(group)
+		if err != nil {
+			c.Error("error to sync group %v member : %v", m.Head.GroupInfo.GroupCode, err)
+			return nil
+		}
+		group.Members = mem
 	}
 	var anonInfo *msg.AnonymousGroupMessage
 	for _, e := range m.Body.RichText.Elems {