diff --git a/client/client.go b/client/client.go
index 13f7efcb..5edb42d9 100644
--- a/client/client.go
+++ b/client/client.go
@@ -379,7 +379,7 @@ func (c *QQClient) SendGroupMessage(groupCode int64, m *message.SendingMessage,
 				Message:    m.Elements,
 			},
 		}})
-		if ret != nil && ret.Id == -1 {
+		if ret != nil && ret.Sources[0] == -1 {
 			c.Error("long message send error. trying fragmented sending...")
 			return c.SendGroupMessage(groupCode, m, true)
 		}
@@ -417,7 +417,7 @@ func (c *QQClient) sendGroupMessage(groupCode int64, forward bool, m *message.Se
 	}
 	var mid int32
 	ret := &message.GroupMessage{
-		Id:         -1,
+		Sources:    []int32{-1},
 		InternalId: mr,
 		GroupCode:  groupCode,
 		Sender: &message.Sender{
@@ -433,7 +433,7 @@ func (c *QQClient) sendGroupMessage(groupCode int64, forward bool, m *message.Se
 	case <-time.After(time.Second * 5):
 		return ret
 	}
-	ret.Id = mid
+	ret.Sources = []int32{mid}
 	return ret
 }
 
diff --git a/client/decoders.go b/client/decoders.go
index ac98d575..13de90de 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -316,25 +316,25 @@ func decodeGroupMessagePacket(c *QQClient, _ uint16, payload []byte) (interface{
 		return nil, nil
 	}
 	if pkt.Message.Content != nil && pkt.Message.Content.PkgNum > 1 {
-		var builder *groupMessageBuilder // TODO: 支持多SEQ
+		var builder *groupMessageBuilder
 		i, ok := c.groupMsgBuilders.Load(pkt.Message.Content.DivSeq)
 		if !ok {
 			builder = &groupMessageBuilder{
-				MessageSeq:   pkt.Message.Content.DivSeq,
-				MessageCount: pkt.Message.Content.PkgNum,
+				SliceSeq:   pkt.Message.Content.DivSeq,
+				SliceCount: pkt.Message.Content.PkgNum,
 			}
 			c.groupMsgBuilders.Store(pkt.Message.Content.DivSeq, builder)
 		} else {
 			builder = i.(*groupMessageBuilder)
 		}
 		builder.MessageSlices = append(builder.MessageSlices, pkt.Message)
-		if int32(len(builder.MessageSlices)) >= builder.MessageCount {
+		if int32(len(builder.MessageSlices)) >= builder.SliceCount {
 			c.groupMsgBuilders.Delete(pkt.Message.Content.DivSeq)
-			c.dispatchGroupMessage(c.parseGroupMessage(builder.build()))
+			c.dispatchGroupMessage(c.parseGroupMessage(builder.build(), builder.seqs()))
 		}
 		return nil, nil
 	}
-	c.dispatchGroupMessage(c.parseGroupMessage(pkt.Message))
+	c.dispatchGroupMessage(c.parseGroupMessage(pkt.Message, nil))
 	return nil, nil
 }
 
diff --git a/client/global.go b/client/global.go
index c474d90e..6c641211 100644
--- a/client/global.go
+++ b/client/global.go
@@ -63,8 +63,9 @@ type DeviceInfoFile struct {
 }
 
 type groupMessageBuilder struct {
-	MessageSeq    int32
-	MessageCount  int32
+	SliceSeq   int32
+	SliceCount int32
+
 	MessageSlices []*msg.Message
 }
 
@@ -243,11 +244,11 @@ func (c *QQClient) parsePrivateMessage(msg *msg.Message) *message.PrivateMessage
 	return ret
 }
 
-func (c *QQClient) parseTempMessage(msg *msg.Message) *message.TempMessage {
-	group := c.FindGroupByUin(msg.Head.C2CTmpMsgHead.GroupUin)
-	mem := group.FindMember(msg.Head.FromUin)
+func (c *QQClient) parseTempMessage(m *msg.Message) *message.TempMessage {
+	group := c.FindGroupByUin(m.Head.C2CTmpMsgHead.GroupUin)
+	mem := group.FindMember(m.Head.FromUin)
 	sender := &message.Sender{
-		Uin:      msg.Head.FromUin,
+		Uin:      m.Head.FromUin,
 		Nickname: "Unknown",
 		IsFriend: false,
 	}
@@ -256,15 +257,15 @@ func (c *QQClient) parseTempMessage(msg *msg.Message) *message.TempMessage {
 		sender.CardName = mem.CardName
 	}
 	return &message.TempMessage{
-		Id:        msg.Head.MsgSeq,
+		Id:        m.Head.MsgSeq,
 		GroupCode: group.Code,
 		GroupName: group.Name,
 		Sender:    sender,
-		Elements:  message.ParseMessageElems(msg.Body.RichText.Elems),
+		Elements:  message.ParseMessageElems(m.Body.RichText.Elems),
 	}
 }
 
-func (c *QQClient) parseGroupMessage(m *msg.Message) *message.GroupMessage {
+func (c *QQClient) parseGroupMessage(m *msg.Message, seqs []int32) *message.GroupMessage {
 	group := c.FindGroup(m.Head.GroupInfo.GroupCode)
 	if group == nil {
 		c.Debug("sync group %v.", m.Head.GroupInfo.GroupCode)
@@ -319,8 +320,14 @@ func (c *QQClient) parseGroupMessage(m *msg.Message) *message.GroupMessage {
 		}
 	}
 	var g *message.GroupMessage
+	seq := func() []int32 {
+		if len(seqs) == 0 {
+			return []int32{m.Head.MsgSeq}
+		}
+		return seqs
+	}()
 	g = &message.GroupMessage{
-		Id:        m.Head.MsgSeq,
+		Sources:   seq,
 		GroupCode: group.Code,
 		GroupName: string(m.Head.GroupInfo.GroupName),
 		Sender:    sender,
@@ -333,7 +340,7 @@ func (c *QQClient) parseGroupMessage(m *msg.Message) *message.GroupMessage {
 		if elem.GeneralFlags != nil && elem.GeneralFlags.LongTextResid != "" {
 			if f := c.GetForwardMessage(elem.GeneralFlags.LongTextResid); f != nil && len(f.Nodes) == 1 {
 				g = &message.GroupMessage{
-					Id:        m.Head.MsgSeq,
+					Sources:   seq,
 					GroupCode: group.Code,
 					GroupName: string(m.Head.GroupInfo.GroupName),
 					Sender:    sender,
@@ -370,6 +377,16 @@ func (b *groupMessageBuilder) build() *msg.Message {
 	return base
 }
 
+func (b *groupMessageBuilder) seqs() (r []int32) {
+	sort.Slice(b.MessageSlices, func(i, j int) bool {
+		return b.MessageSlices[i].Content.PkgIndex < b.MessageSlices[i].Content.PkgIndex
+	})
+	for _, m := range b.MessageSlices {
+		r = append(r, m.Head.MsgSeq)
+	}
+	return
+}
+
 func packRequestDataV3(data []byte) (r []byte) {
 	r = append([]byte{0x0A}, data...)
 	r = append(r, 0x0B)
diff --git a/message/elements.go b/message/elements.go
index a6466e0a..3f5a07f5 100644
--- a/message/elements.go
+++ b/message/elements.go
@@ -168,7 +168,7 @@ func AtAll() *AtElement {
 
 func NewReply(m *GroupMessage) *ReplyElement {
 	return &ReplyElement{
-		ReplySeq: m.Id,
+		ReplySeq: m.Sources[0],
 		Sender:   m.Sender.Uin,
 		Time:     m.Time,
 		//original: m.OriginalElements,
diff --git a/message/message.go b/message/message.go
index a6827c6a..573f2fc0 100644
--- a/message/message.go
+++ b/message/message.go
@@ -33,7 +33,7 @@ type (
 	}
 
 	GroupMessage struct {
-		Id         int32
+		Sources    []int32
 		InternalId int32
 		GroupCode  int64
 		GroupName  string