diff --git a/client/decoders.go b/client/decoders.go
index 9c0a3131..2b51c0f5 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -13,7 +13,6 @@ import (
 	"github.com/Mrs4s/MiraiGo/client/pb/structmsg"
 	"github.com/Mrs4s/MiraiGo/utils"
 	"github.com/golang/protobuf/proto"
-	"math"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -229,12 +228,17 @@ func decodeMessageSvcPacket(c *QQClient, _ uint16, payload []byte) (interface{},
 				if message.Body.RichText == nil || message.Body.RichText.Elems == nil {
 					continue
 				}
-				if c.lastMessageSeq >= message.Head.MsgSeq {
-					if math.Abs(float64(c.lastMessageSeq-message.Head.MsgSeq)) < 1000 {
-						continue
-					}
+				friend := c.FindFriend(message.Head.FromUin)
+				if friend == nil {
+					return nil, nil
 				}
-				c.lastMessageSeq = message.Head.MsgSeq
+				if friend.msgSeqList == nil {
+					friend.msgSeqList = utils.NewTTList(60)
+				}
+				if friend.msgSeqList.Any(func(i interface{}) bool { return i.(int32) == message.Head.MsgSeq }) {
+					continue
+				}
+				friend.msgSeqList.Add(message.Head.MsgSeq)
 				c.dispatchFriendMessage(c.parsePrivateMessage(message))
 			case 187:
 				_, pkt := c.buildSystemMsgNewFriendPacket()
diff --git a/client/entities.go b/client/entities.go
index 2bd3dfdd..cafffec1 100644
--- a/client/entities.go
+++ b/client/entities.go
@@ -2,6 +2,7 @@ package client
 
 import (
 	"errors"
+	"github.com/Mrs4s/MiraiGo/utils"
 	"strings"
 	"sync"
 )
@@ -35,6 +36,8 @@ type (
 		Nickname string
 		Remark   string
 		FaceId   int16
+
+		msgSeqList *utils.TTList
 	}
 
 	FriendListResponse struct {
diff --git a/utils/ttlmap.go b/utils/ttlmap.go
new file mode 100644
index 00000000..4248e900
--- /dev/null
+++ b/utils/ttlmap.go
@@ -0,0 +1,60 @@
+package utils
+
+import (
+	"sync"
+	"time"
+)
+
+type TTList struct {
+	list []*item
+	lock *sync.Mutex
+}
+
+type item struct {
+	i          interface{}
+	lastAccess int64
+}
+
+func NewTTList(ttl int64) *TTList {
+	l := &TTList{
+		lock: new(sync.Mutex),
+	}
+	go func() {
+		for now := range time.Tick(time.Second * 5) {
+			l.lock.Lock()
+			pos := 0
+			for _, i := range l.list {
+				if now.Unix()-i.lastAccess > ttl {
+					l.list = append(l.list[:pos], l.list[pos+1:]...)
+					if pos > 0 {
+						pos++
+					}
+				}
+				pos++
+			}
+			l.lock.Unlock()
+		}
+	}()
+	return l
+}
+
+func (l *TTList) Add(i interface{}) {
+	l.lock.Lock()
+	l.lock.Unlock()
+	l.list = append(l.list, &item{
+		i:          i,
+		lastAccess: time.Now().Unix(),
+	})
+}
+
+func (l *TTList) Any(filter func(i interface{}) bool) bool {
+	l.lock.Lock()
+	l.lock.Unlock()
+	for _, it := range l.list {
+		if filter(it.i) {
+			it.lastAccess = time.Now().Unix()
+			return true
+		}
+	}
+	return false
+}