diff --git a/client/c2c_processor.go b/client/c2c_processor.go
index 5a19ba5e..e2cdd03f 100644
--- a/client/c2c_processor.go
+++ b/client/c2c_processor.go
@@ -4,7 +4,6 @@ package client
 
 import (
 	"fmt"
-	"sync/atomic"
 	"time"
 
 	"github.com/pkg/errors"
@@ -104,9 +103,9 @@ func privateMessageDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo
 	case 11, 175: // friend msg
 		if pMsg.Head.GetFromUin() == c.Uin {
 			for {
-				frdSeq := atomic.LoadInt32(&c.friendSeq)
+				frdSeq := c.friendSeq.Load()
 				if frdSeq < pMsg.Head.GetMsgSeq() {
-					if atomic.CompareAndSwapInt32(&c.friendSeq, frdSeq, pMsg.Head.GetMsgSeq()) {
+					if c.friendSeq.CAS(frdSeq, pMsg.Head.GetMsgSeq()) {
 						break
 					}
 				} else {
diff --git a/client/client.go b/client/client.go
index c7533f39..6a8c9587 100644
--- a/client/client.go
+++ b/client/client.go
@@ -7,10 +7,10 @@ import (
 	"net"
 	"sort"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/pkg/errors"
+	"go.uber.org/atomic"
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/binary/jce"
@@ -34,18 +34,18 @@ type QQClient struct {
 	AllowSlider bool
 
 	// account info
+	Online        atomic.Bool
 	Nickname      string
 	Age           uint16
 	Gender        uint16
 	FriendList    []*FriendInfo
 	GroupList     []*GroupInfo
 	OnlineClients []*OtherClientInfo
-	Online        bool
 	QiDian        *QiDianAccountInfo
 	GuildService  *GuildService
 
 	// protocol public field
-	SequenceId              int32
+	SequenceId              atomic.Int32
 	OutGoingPacketSessionId []byte
 	RandomKey               []byte
 	TCP                     *utils.TCPListener
@@ -81,7 +81,7 @@ type QQClient struct {
 	ksid             []byte
 
 	// session info
-	qwebSeq        int64
+	qwebSeq        atomic.Int64
 	sigInfo        *loginSigInfo
 	highwaySession *highway.Session
 	dpwd           []byte
@@ -99,11 +99,11 @@ type QQClient struct {
 	groupSysMsgCache       *GroupSystemMessages
 	groupMsgBuilders       sync.Map
 	onlinePushCache        *utils.Cache
-	requestPacketRequestID int32
-	groupSeq               int32
-	friendSeq              int32
 	heartbeatEnabled       bool
-	highwayApplyUpSeq      int32
+	requestPacketRequestID atomic.Int32
+	groupSeq               atomic.Int32
+	friendSeq              atomic.Int32
+	highwayApplyUpSeq      atomic.Int32
 	eventHandlers          *eventHandlers
 
 	groupListLock sync.Mutex
@@ -196,16 +196,11 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 	cli := &QQClient{
 		Uin:                     uin,
 		PasswordMd5:             passwordMd5,
-		SequenceId:              0x3635,
 		AllowSlider:             true,
 		RandomKey:               make([]byte, 16),
 		OutGoingPacketSessionId: []byte{0x02, 0xB0, 0x5B, 0x8B},
 		TCP:                     &utils.TCPListener{},
 		sigInfo:                 &loginSigInfo{},
-		requestPacketRequestID:  1921334513,
-		groupSeq:                int32(rand.Intn(20000)),
-		friendSeq:               22911,
-		highwayApplyUpSeq:       77918,
 		eventHandlers:           &eventHandlers{},
 		msgSvcCache:             utils.NewCache(time.Second * 15),
 		transCache:              utils.NewCache(time.Second * 15),
@@ -214,6 +209,13 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 		alive:                   true,
 		ecdh:                    crypto.NewEcdh(),
 	}
+	{ // init atomic values
+		cli.SequenceId.Store(0x3635)
+		cli.requestPacketRequestID.Store(1921334513)
+		cli.groupSeq.Store(int32(rand.Intn(20000)))
+		cli.friendSeq.Store(22911)
+		cli.highwayApplyUpSeq.Store(77918)
+	}
 	cli.GuildService = &GuildService{c: cli}
 	cli.ecdh.FetchPubKey(uin)
 	cli.UseDevice(SystemDeviceInfo)
@@ -277,7 +279,7 @@ func (c *QQClient) UseDevice(info *DeviceInfo) {
 }
 
 func (c *QQClient) Release() {
-	if c.Online {
+	if c.Online.Load() {
 		c.Disconnect()
 	}
 	c.alive = false
@@ -285,7 +287,7 @@ func (c *QQClient) Release() {
 
 // Login send login request
 func (c *QQClient) Login() (*LoginResponse, error) {
-	if c.Online {
+	if c.Online.Load() {
 		return nil, ErrAlreadyOnline
 	}
 	err := c.connect()
@@ -305,7 +307,7 @@ func (c *QQClient) Login() (*LoginResponse, error) {
 }
 
 func (c *QQClient) TokenLogin(token []byte) error {
-	if c.Online {
+	if c.Online.Load() {
 		return ErrAlreadyOnline
 	}
 	err := c.connect()
@@ -334,7 +336,7 @@ func (c *QQClient) TokenLogin(token []byte) error {
 }
 
 func (c *QQClient) FetchQRCode() (*QRCodeLoginResponse, error) {
-	if c.Online {
+	if c.Online.Load() {
 		return nil, ErrAlreadyOnline
 	}
 	err := c.connect()
@@ -778,39 +780,39 @@ func (c *QQClient) SetCustomServer(servers []*net.TCPAddr) {
 func (c *QQClient) registerClient() error {
 	_, err := c.sendAndWait(c.buildClientRegisterPacket())
 	if err == nil {
-		c.Online = true
+		c.Online.Store(true)
 	}
 	return err
 }
 
 func (c *QQClient) nextSeq() uint16 {
-	return uint16(atomic.AddInt32(&c.SequenceId, 1) & 0x7FFF)
+	return uint16(c.SequenceId.Add(1) & 0x7FFF)
 }
 
 func (c *QQClient) nextPacketSeq() int32 {
-	return atomic.AddInt32(&c.requestPacketRequestID, 2)
+	return c.requestPacketRequestID.Add(2)
 }
 
 func (c *QQClient) nextGroupSeq() int32 {
-	return atomic.AddInt32(&c.groupSeq, 2)
+	return c.groupSeq.Add(2)
 }
 
 func (c *QQClient) nextFriendSeq() int32 {
-	return atomic.AddInt32(&c.friendSeq, 1)
+	return c.friendSeq.Add(1)
 }
 
 func (c *QQClient) nextQWebSeq() int64 {
-	return atomic.AddInt64(&c.qwebSeq, 1)
+	return c.qwebSeq.Add(1)
 }
 
 func (c *QQClient) nextHighwayApplySeq() int32 {
-	return atomic.AddInt32(&c.highwayApplyUpSeq, 2)
+	return c.highwayApplyUpSeq.Add(2)
 }
 
 func (c *QQClient) doHeartbeat() {
 	c.heartbeatEnabled = true
 	times := 0
-	for c.Online {
+	for c.Online.Load() {
 		time.Sleep(time.Second * 30)
 		seq := c.nextSeq()
 		sso := packets.BuildSsoPacket(seq, c.version.AppId, c.version.SubAppId, "Heartbeat.Alive", c.deviceInfo.IMEI, []byte{}, c.OutGoingPacketSessionId, []byte{}, c.ksid)
diff --git a/client/network.go b/client/network.go
index 9018696e..1628ae71 100644
--- a/client/network.go
+++ b/client/network.go
@@ -4,7 +4,6 @@ import (
 	"net"
 	"runtime/debug"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/pkg/errors"
@@ -33,7 +32,7 @@ type ConnectionQualityInfo struct {
 }
 
 func (c *QQClient) ConnectionQualityTest() *ConnectionQualityInfo {
-	if !c.Online {
+	if !c.Online.Load() {
 		return nil
 	}
 	r := &ConnectionQualityInfo{}
@@ -102,19 +101,19 @@ func (c *QQClient) connect() error {
 	}
 	c.once.Do(func() {
 		c.OnGroupMessage(func(_ *QQClient, _ *message.GroupMessage) {
-			atomic.AddUint64(&c.stat.MessageReceived, 1)
-			atomic.StoreInt64(&c.stat.LastMessageTime, time.Now().Unix())
+			c.stat.MessageReceived.Add(1)
+			c.stat.LastMessageTime.Store(time.Now().Unix())
 		})
 		c.OnPrivateMessage(func(_ *QQClient, _ *message.PrivateMessage) {
-			atomic.AddUint64(&c.stat.MessageReceived, 1)
-			atomic.StoreInt64(&c.stat.LastMessageTime, time.Now().Unix())
+			c.stat.MessageReceived.Add(1)
+			c.stat.LastMessageTime.Store(time.Now().Unix())
 		})
 		c.OnTempMessage(func(_ *QQClient, _ *TempMessageEvent) {
-			atomic.AddUint64(&c.stat.MessageReceived, 1)
-			atomic.StoreInt64(&c.stat.LastMessageTime, time.Now().Unix())
+			c.stat.MessageReceived.Add(1)
+			c.stat.LastMessageTime.Store(time.Now().Unix())
 		})
 		c.onGroupMessageReceipt("internal", func(_ *QQClient, _ *groupMessageReceiptEvent) {
-			atomic.AddUint64(&c.stat.MessageSent, 1)
+			c.stat.MessageSent.Add(1)
 		})
 		go c.netLoop()
 	})
@@ -142,7 +141,7 @@ func (c *QQClient) quickReconnect() {
 
 // Disconnect 中断连接, 不释放资源
 func (c *QQClient) Disconnect() {
-	c.Online = false
+	c.Online.Store(false)
 	c.TCP.Close()
 }
 
@@ -193,9 +192,9 @@ func (c *QQClient) sendAndWait(seq uint16, pkt []byte, params ...requestParams)
 func (c *QQClient) sendPacket(pkt []byte) error {
 	err := c.TCP.Write(pkt)
 	if err != nil {
-		atomic.AddUint64(&c.stat.PacketLost, 1)
+		c.stat.PacketLost.Add(1)
 	} else {
-		atomic.AddUint64(&c.stat.PacketSent, 1)
+		c.stat.PacketSent.Add(1)
 	}
 	return errors.Wrap(err, "Packet failed to sendPacket")
 }
@@ -251,15 +250,15 @@ func (c *QQClient) sendAndWaitDynamic(seq uint16, pkt []byte) ([]byte, error) {
 // plannedDisconnect 计划中断线事件
 func (c *QQClient) plannedDisconnect(_ *utils.TCPListener) {
 	c.Debug("planned disconnect.")
-	atomic.AddUint32(&c.stat.DisconnectTimes, 1)
-	c.Online = false
+	c.stat.DisconnectTimes.Add(1)
+	c.Online.Store(false)
 }
 
 // unexpectedDisconnect 非预期断线事件
 func (c *QQClient) unexpectedDisconnect(_ *utils.TCPListener, e error) {
 	c.Error("unexpected disconnect: %v", e)
-	atomic.AddUint32(&c.stat.DisconnectTimes, 1)
-	c.Online = false
+	c.stat.DisconnectTimes.Add(1)
+	c.Online.Store(false)
 	if err := c.connect(); err != nil {
 		c.Error("connect server error: %v", err)
 		c.dispatchDisconnectEvent(&ClientDisconnectedEvent{Message: "connection dropped by server."})
@@ -317,7 +316,7 @@ func (c *QQClient) netLoop() {
 		}
 		errCount = 0
 		c.Debug("rev pkt: %v seq: %v", pkt.CommandName, pkt.SequenceId)
-		atomic.AddUint64(&c.stat.PacketReceived, 1)
+		c.stat.PacketReceived.Add(1)
 		go func(pkt *packets.IncomingPacket) {
 			defer func() {
 				if pan := recover(); pan != nil {
diff --git a/client/private_msg.go b/client/private_msg.go
index 4aa9b30a..4313c168 100644
--- a/client/private_msg.go
+++ b/client/private_msg.go
@@ -2,7 +2,6 @@ package client
 
 import (
 	"math/rand"
-	"sync/atomic"
 	"time"
 
 	"github.com/pkg/errors"
@@ -47,7 +46,7 @@ func (c *QQClient) SendPrivateMessage(target int64, m *message.SendingMessage) *
 		_, pkt := c.buildFriendSendingPacket(target, seq, mr, 1, 0, 0, t, m.Elements)
 		_ = c.sendPacket(pkt)
 	}
-	atomic.AddUint64(&c.stat.MessageSent, 1)
+	c.stat.MessageSent.Add(1)
 	ret := &message.PrivateMessage{
 		Id:         seq,
 		InternalId: mr,
@@ -86,7 +85,7 @@ func (c *QQClient) SendGroupTempMessage(groupCode, target int64, m *message.Send
 	t := time.Now().Unix()
 	_, pkt := c.buildGroupTempSendingPacket(group.Uin, target, seq, mr, t, m)
 	_ = c.sendPacket(pkt)
-	atomic.AddUint64(&c.stat.MessageSent, 1)
+	c.stat.MessageSent.Add(1)
 	return &message.TempMessage{
 		Id:        seq,
 		GroupCode: group.Code,
@@ -107,7 +106,7 @@ func (c *QQClient) sendWPATempMessage(target int64, sig []byte, m *message.Sendi
 	t := time.Now().Unix()
 	_, pkt := c.buildWPATempSendingPacket(target, sig, seq, mr, t, m)
 	_ = c.sendPacket(pkt)
-	atomic.AddUint64(&c.stat.MessageSent, 1)
+	c.stat.MessageSent.Add(1)
 	return &message.TempMessage{
 		Id:   seq,
 		Self: c.Uin,
diff --git a/client/statistics.go b/client/statistics.go
index 178603da..7daf871c 100644
--- a/client/statistics.go
+++ b/client/statistics.go
@@ -1,43 +1,18 @@
 package client
 
 import (
-	"bytes"
-	"strconv"
-	"sync/atomic"
+	"go.uber.org/atomic"
 )
 
 type Statistics struct {
-	PacketReceived  uint64
-	PacketSent      uint64
-	PacketLost      uint64
-	MessageReceived uint64
-	MessageSent     uint64
-	LastMessageTime int64
-	DisconnectTimes uint32
-	LostTimes       uint32
-}
-
-func (s *Statistics) MarshalJSON() ([]byte, error) {
-	var w bytes.Buffer
-	w.Grow(256)
-	w.WriteString(`{"packet_received":`)
-	w.WriteString(strconv.FormatUint(atomic.LoadUint64(&s.PacketReceived), 10))
-	w.WriteString(`,"packet_sent":`)
-	w.WriteString(strconv.FormatUint(atomic.LoadUint64(&s.PacketSent), 10))
-	w.WriteString(`,"packet_lost":`)
-	w.WriteString(strconv.FormatUint(atomic.LoadUint64(&s.PacketLost), 10))
-	w.WriteString(`,"message_received":`)
-	w.WriteString(strconv.FormatUint(atomic.LoadUint64(&s.MessageReceived), 10))
-	w.WriteString(`,"message_sent":`)
-	w.WriteString(strconv.FormatUint(atomic.LoadUint64(&s.MessageSent), 10))
-	w.WriteString(`,"disconnect_times":`)
-	w.WriteString(strconv.FormatUint(uint64(atomic.LoadUint32(&s.DisconnectTimes)), 10))
-	w.WriteString(`,"lost_times":`)
-	w.WriteString(strconv.FormatUint(uint64(atomic.LoadUint32(&s.LostTimes)), 10))
-	w.WriteString(`,"last_message_time":`)
-	w.WriteString(strconv.FormatInt(atomic.LoadInt64(&s.LastMessageTime), 10))
-	w.WriteByte('}')
-	return w.Bytes(), nil
+	PacketReceived  atomic.Uint64
+	PacketSent      atomic.Uint64
+	PacketLost      atomic.Uint64
+	MessageReceived atomic.Uint64
+	MessageSent     atomic.Uint64
+	LastMessageTime atomic.Int64
+	DisconnectTimes atomic.Uint32
+	LostTimes       atomic.Uint32
 }
 
 func (c *QQClient) GetStatistics() *Statistics {
diff --git a/client/sync.go b/client/sync.go
index 1e073376..a54d26b1 100644
--- a/client/sync.go
+++ b/client/sync.go
@@ -3,7 +3,6 @@ package client
 import (
 	"math/rand"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/pkg/errors"
@@ -150,7 +149,7 @@ func (c *QQClient) buildGetOfflineMsgRequestPacket() (uint16, []byte) {
 		C2CMsg: &jce.SvcReqGetMsgV2{
 			Uin: c.Uin,
 			DateTime: func() int32 {
-				t := atomic.LoadInt64(&c.stat.LastMessageTime)
+				t := c.stat.LastMessageTime.Load()
 				if t == 0 {
 					return 1
 				}
@@ -219,7 +218,7 @@ func (c *QQClient) buildSyncMsgRequestPacket() (uint16, []byte) {
 		C2CMsg: &jce.SvcReqGetMsgV2{
 			Uin: c.Uin,
 			DateTime: func() int32 {
-				t := atomic.LoadInt64(&c.stat.LastMessageTime)
+				t := c.stat.LastMessageTime.Load()
 				if t == 0 {
 					return 1
 				}
diff --git a/go.mod b/go.mod
index 459f2f15..67ce77f9 100644
--- a/go.mod
+++ b/go.mod
@@ -9,12 +9,13 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.7.0
 	github.com/tidwall/gjson v1.11.0
+	go.uber.org/atomic v1.9.0
 	golang.org/x/net v0.0.0-20211123203042-d83791d6bcd9
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 )
 
 require (
-	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.0 // indirect
diff --git a/go.sum b/go.sum
index 6ef9c72a..2beda80c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,8 @@
 github.com/RomiChan/protobuf v0.0.0-20211204042931-ff4f35848737 h1:p4o7/eSoP39jwnGZz08N1IpH/mNzg9SdCn7kPM9A9BE=
 github.com/RomiChan/protobuf v0.0.0-20211204042931-ff4f35848737/go.mod h1:CKKOWC7mBxd36zxsCB1V8DTrwlTNRQvkSVbYqyUiGEE=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/klauspost/compress v1.13.6 h1:P76CopJELS0TiO2mebmnzgWaajssP/EszplttgQxcgc=
@@ -13,6 +14,7 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/tidwall/gjson v1.11.0 h1:C16pk7tQNiH6VlCrtIXL1w8GaOsi1X3W8KDkE1BuYd4=
@@ -21,6 +23,8 @@ github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
 github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
 github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
 github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
+go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 golang.org/x/net v0.0.0-20211123203042-d83791d6bcd9 h1:0qxwC5n+ttVOINCBeRHO0nq9X7uy8SDsPoi5OaCdIEI=
 golang.org/x/net v0.0.0-20211123203042-d83791d6bcd9/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=