diff --git a/client/builders.go b/client/builders.go
index 8001ec3c..608caeeb 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -769,38 +769,6 @@ func (c *QQClient) buildImageUploadPacket(data, updKey []byte, commandId int32,
 	return
 }
 
-// ProfileService.Pb.ReqSystemMsgNew.Group
-func (c *QQClient) buildSystemMsgNewGroupPacket() (uint16, []byte) {
-	seq := c.nextSeq()
-	req := &structmsg.ReqSystemMsgNew{
-		MsgNum:    100,
-		Version:   1000,
-		Checktype: 3,
-		Flag: &structmsg.FlagInfo{
-			GrpMsgKickAdmin:                   1,
-			GrpMsgHiddenGrp:                   1,
-			GrpMsgWordingDown:                 1,
-			GrpMsgGetOfficialAccount:          1,
-			GrpMsgGetPayInGroup:               1,
-			FrdMsgDiscuss2ManyChat:            1,
-			GrpMsgNotAllowJoinGrpInviteNotFrd: 1,
-			FrdMsgNeedWaitingMsg:              1,
-			FrdMsgUint32NeedAllUnreadMsg:      1,
-			GrpMsgNeedAutoAdminWording:        1,
-			GrpMsgGetTransferGroupMsgFlag:     1,
-			GrpMsgGetQuitPayGroupMsgFlag:      1,
-			GrpMsgSupportInviteAutoJoin:       1,
-			GrpMsgMaskInviteAutoJoin:          1,
-			GrpMsgGetDisbandedByAdmin:         1,
-			GrpMsgGetC2CInviteJoinGroup:       1,
-		},
-		FriendMsgTypeFlag: 1,
-	}
-	payload, _ := proto.Marshal(req)
-	packet := packets.BuildUniPacket(c.Uin, seq, "ProfileService.Pb.ReqSystemMsgNew.Group", 1, c.OutGoingPacketSessionId, EmptyBytes, c.sigInfo.d2Key, payload)
-	return seq, packet
-}
-
 // ProfileService.Pb.ReqSystemMsgNew.Friend
 func (c *QQClient) buildSystemMsgNewFriendPacket() (uint16, []byte) {
 	seq := c.nextSeq()
diff --git a/client/client.go b/client/client.go
index 5137eee6..edfcf76b 100644
--- a/client/client.go
+++ b/client/client.go
@@ -75,6 +75,7 @@ type QQClient struct {
 	msgSvcCache            *utils.Cache
 	transCache             *utils.Cache
 	lastLostMsg            string
+	groupSysMsgCache       *GroupSystemMessages
 	groupMsgBuilders       sync.Map
 	onlinePushCache        *utils.Cache
 	requestPacketRequestId int32
@@ -211,12 +212,7 @@ func (c *QQClient) Login() (*LoginResponse, error) {
 	}
 	l := rsp.(LoginResponse)
 	if l.Success {
-		c.Online = true
-		c.lastLostMsg = ""
-		c.registerClient()
-		if !c.heartbeatEnabled {
-			c.startHeartbeat()
-		}
+		c.init()
 	}
 	return &l, nil
 }
@@ -230,11 +226,7 @@ func (c *QQClient) SubmitCaptcha(result string, sign []byte) (*LoginResponse, er
 	}
 	l := rsp.(LoginResponse)
 	if l.Success {
-		c.Online = true
-		c.registerClient()
-		if !c.heartbeatEnabled {
-			c.startHeartbeat()
-		}
+		c.init()
 	}
 	return &l, nil
 }
@@ -246,15 +238,20 @@ func (c *QQClient) SubmitSMS(code string) (*LoginResponse, error) {
 	}
 	l := rsp.(LoginResponse)
 	if l.Success {
-		c.Online = true
-		c.registerClient()
-		if !c.heartbeatEnabled {
-			c.startHeartbeat()
-		}
+		c.init()
 	}
 	return &l, nil
 }
 
+func (c *QQClient) init() {
+	c.Online = true
+	c.registerClient()
+	c.groupSysMsgCache, _ = c.GetGroupSystemMessages()
+	if !c.heartbeatEnabled {
+		c.startHeartbeat()
+	}
+}
+
 func (c *QQClient) RequestSMS() bool {
 	rsp, err := c.sendAndWait(c.buildSMSRequestPacket())
 	if err != nil {
diff --git a/client/decoders.go b/client/decoders.go
index f1a6fd04..cb222d11 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -303,8 +303,7 @@ func decodeMessageSvcPacket(c *QQClient, _ uint16, payload []byte) (interface{},
 				}
 				groupJoinLock.Unlock()
 			case 84, 87:
-				_, pkt := c.buildSystemMsgNewGroupPacket()
-				_ = c.send(pkt)
+				c.exceptAndDispatchGroupSysMsg()
 			case 141: // 临时会话
 				if message.Head.C2CTmpMsgHead == nil {
 					continue
diff --git a/client/system_msg.go b/client/system_msg.go
index 1ccfdde5..21801bf9 100644
--- a/client/system_msg.go
+++ b/client/system_msg.go
@@ -2,38 +2,123 @@ package client
 
 import (
 	"github.com/Mrs4s/MiraiGo/client/pb/structmsg"
+	"github.com/Mrs4s/MiraiGo/protocol/packets"
 	"google.golang.org/protobuf/proto"
-	"log"
 )
 
 type (
 	GroupSystemMessages struct {
-		InvitedRequests []*GroupInvitedRequest
-		JoinRequests    []*UserJoinGroupRequest
+		InvitedRequests []*GroupInvitedRequest  `json:"invited_requests"`
+		JoinRequests    []*UserJoinGroupRequest `json:"join_requests"`
 	}
 
 	GroupInvitedRequest struct {
-		RequestId   int64
-		InvitorUin  int64
-		InvitorNick string
-		GroupCode   int64
-		GroupName   string
+		RequestId   int64  `json:"request_id"`
+		InvitorUin  int64  `json:"invitor_uin"`
+		InvitorNick string `json:"invitor_nick"`
+		GroupCode   int64  `json:"group_code"`
+		GroupName   string `json:"group_name"`
+
+		Checked bool  `json:"checked"`
+		Actor   int64 `json:"actor"`
 
 		client *QQClient
 	}
 
 	UserJoinGroupRequest struct {
-		RequestId     int64
-		Message       string
-		RequesterUin  int64
-		RequesterNick string
-		GroupCode     int64
-		GroupName     string
+		RequestId     int64  `json:"request_id"`
+		Message       string `json:"message"`
+		RequesterUin  int64  `json:"requester_uin"`
+		RequesterNick string `json:"requester_nick"`
+		GroupCode     int64  `json:"group_code"`
+		GroupName     string `json:"group_name"`
+
+		Checked bool  `json:"checked"`
+		Actor   int64 `json:"actor"`
 
 		client *QQClient
 	}
 )
 
+func (c *QQClient) GetGroupSystemMessages() (*GroupSystemMessages, error) {
+	i, err := c.sendAndWait(c.buildSystemMsgNewGroupPacket())
+	if err != nil {
+		return nil, err
+	}
+	return i.(*GroupSystemMessages), nil
+}
+
+func (c *QQClient) exceptAndDispatchGroupSysMsg() {
+	if c.groupSysMsgCache == nil {
+		c.Error("warning: groupSysMsgCache is nil")
+		c.groupSysMsgCache, _ = c.GetGroupSystemMessages()
+		return
+	}
+	joinExists := func(req int64) bool {
+		for _, msg := range c.groupSysMsgCache.JoinRequests {
+			if req == msg.RequestId {
+				return true
+			}
+		}
+		return false
+	}
+	invExists := func(req int64) bool {
+		for _, msg := range c.groupSysMsgCache.InvitedRequests {
+			if req == msg.RequestId {
+				return true
+			}
+		}
+		return false
+	}
+	msgs, err := c.GetGroupSystemMessages()
+	if err != nil {
+		return
+	}
+	for _, msg := range msgs.JoinRequests {
+		if !joinExists(msg.RequestId) {
+			c.dispatchJoinGroupRequest(msg)
+		}
+	}
+	for _, msg := range msgs.InvitedRequests {
+		if !invExists(msg.RequestId) {
+			c.dispatchGroupInvitedEvent(msg)
+		}
+	}
+	c.groupSysMsgCache = msgs
+}
+
+// ProfileService.Pb.ReqSystemMsgNew.Group
+func (c *QQClient) buildSystemMsgNewGroupPacket() (uint16, []byte) {
+	seq := c.nextSeq()
+	req := &structmsg.ReqSystemMsgNew{
+		MsgNum:    100,
+		Version:   1000,
+		Checktype: 3,
+		Flag: &structmsg.FlagInfo{
+			GrpMsgKickAdmin:                   1,
+			GrpMsgHiddenGrp:                   1,
+			GrpMsgWordingDown:                 1,
+			GrpMsgGetOfficialAccount:          1,
+			GrpMsgGetPayInGroup:               1,
+			FrdMsgDiscuss2ManyChat:            1,
+			GrpMsgNotAllowJoinGrpInviteNotFrd: 1,
+			FrdMsgNeedWaitingMsg:              1,
+			FrdMsgUint32NeedAllUnreadMsg:      1,
+			GrpMsgNeedAutoAdminWording:        1,
+			GrpMsgGetTransferGroupMsgFlag:     1,
+			GrpMsgGetQuitPayGroupMsgFlag:      1,
+			GrpMsgSupportInviteAutoJoin:       1,
+			GrpMsgMaskInviteAutoJoin:          1,
+			GrpMsgGetDisbandedByAdmin:         1,
+			GrpMsgGetC2CInviteJoinGroup:       1,
+		},
+		FriendMsgTypeFlag: 1,
+	}
+	payload, _ := proto.Marshal(req)
+	packet := packets.BuildUniPacket(c.Uin, seq, "ProfileService.Pb.ReqSystemMsgNew.Group", 1, c.OutGoingPacketSessionId, EmptyBytes, c.sigInfo.d2Key, payload)
+	return seq, packet
+}
+
 // ProfileService.Pb.ReqSystemMsgNew.Group
 func decodeSystemMsgGroupPacket(c *QQClient, _ uint16, payload []byte) (interface{}, error) {
 	rsp := structmsg.RspSystemMsgNew{}
@@ -48,8 +133,8 @@ func decodeSystemMsgGroupPacket(c *QQClient, _ uint16, payload []byte) (interfac
 		if st.Msg == nil {
 			continue
 		}
-		if st.Msg.SubType == 1 {
-			// 处理被邀请入群 或 处理成员入群申请
+		switch st.Msg.SubType {
+		case 1, 2: // 处理被邀请入群 或 处理成员入群申请
 			switch st.Msg.GroupMsgType {
 			case 1: // 成员申请
 				ret.JoinRequests = append(ret.JoinRequests, &UserJoinGroupRequest{
@@ -59,6 +144,8 @@ func decodeSystemMsgGroupPacket(c *QQClient, _ uint16, payload []byte) (interfac
 					RequesterNick: st.Msg.ReqUinNick,
 					GroupCode:     st.Msg.GroupCode,
 					GroupName:     st.Msg.GroupName,
+					Checked:       st.Msg.SubType == 2,
+					Actor:         st.Msg.ActorUin,
 					client:        c,
 				})
 			case 2: // 被邀请
@@ -68,19 +155,17 @@ func decodeSystemMsgGroupPacket(c *QQClient, _ uint16, payload []byte) (interfac
 					InvitorNick: st.Msg.ActionUinNick,
 					GroupCode:   st.Msg.GroupCode,
 					GroupName:   st.Msg.GroupName,
+					Checked:     st.Msg.SubType == 2,
+					Actor:       st.Msg.ActorUin,
 					client:      c,
 				})
 			default:
-				log.Println("unknown group msg:", st)
+				c.Error("unknown group message type: %v", st.Msg.GroupMsgType)
 			}
-		} else if st.Msg.SubType == 2 {
-			// 被邀请入群, 自动同意, 不需处理
-		} else if st.Msg.SubType == 3 {
-			// 已被其他管理员处理
-		} else if st.Msg.SubType == 5 {
-			// 成员退群消息
-		} else {
-			log.Println("unknown group msg:", st)
+		case 3: // ?
+		case 5: // 自身状态变更(管理员/加群退群)
+		default:
+			c.Error("unknown group msg: %v", st.Msg.SubType)
 		}
 	}
 	return ret, nil