diff --git a/client/decoders.go b/client/decoders.go
index baa19a37..6928c7d8 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -363,16 +363,13 @@ func decodeGroupMessagePacket(c *QQClient, _ uint16, payload []byte) (interface{
 		var builder *groupMessageBuilder // TODO: 支持多SEQ
 		i, ok := c.groupMsgBuilders.Load(pkt.Message.Content.DivSeq)
 		if !ok {
-			builder = &groupMessageBuilder{
-				MessageSeq:   pkt.Message.Content.DivSeq,
-				MessageCount: pkt.Message.Content.PkgNum,
-			}
+			builder = &groupMessageBuilder{}
 			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)) >= pkt.Message.Content.PkgNum {
 			c.groupMsgBuilders.Delete(pkt.Message.Content.DivSeq)
 			c.dispatchGroupMessage(c.parseGroupMessage(builder.build()))
 		}
diff --git a/client/global.go b/client/global.go
index 70ab161f..60abfd6a 100644
--- a/client/global.go
+++ b/client/global.go
@@ -63,8 +63,6 @@ type DeviceInfoFile struct {
 }
 
 type groupMessageBuilder struct {
-	MessageSeq    int32
-	MessageCount  int32
 	MessageSlices []*msg.Message
 }
 
@@ -434,7 +432,7 @@ func (c *QQClient) parseGroupMessage(m *msg.Message) *message.GroupMessage {
 
 func (b *groupMessageBuilder) build() *msg.Message {
 	sort.Slice(b.MessageSlices, func(i, j int) bool {
-		return b.MessageSlices[i].Content.PkgIndex < b.MessageSlices[i].Content.PkgIndex
+		return b.MessageSlices[i].Content.PkgIndex < b.MessageSlices[j].Content.PkgIndex
 	})
 	base := b.MessageSlices[0]
 	for _, m := range b.MessageSlices[1:] {