diff --git a/statistic/memory/memory.go b/statistic/memory/memory.go
index e4c1f52ba..4de5b6ae6 100644
--- a/statistic/memory/memory.go
+++ b/statistic/memory/memory.go
@@ -21,13 +21,14 @@ type User struct {
 	recv        uint64
 	lastSent    uint64
 	lastRecv    uint64
-	speedLock   sync.Mutex
+	speedLock   sync.RWMutex
 	sendSpeed   uint64
 	recvSpeed   uint64
 	hash        string
-	ipTableLock sync.Mutex
+	ipTableLock sync.RWMutex
 	ipTable     map[string]struct{}
 	maxIPNum    int
+	limiterLock sync.RWMutex
 	sendLimiter *rate.Limiter
 	recvLimiter *rate.Limiter
 	ctx         context.Context
@@ -72,8 +73,8 @@ func (u *User) DelIP(ip string) bool {
 }
 
 func (u *User) GetIP() int {
-	u.ipTableLock.Lock()
-	defer u.ipTableLock.Unlock()
+	u.ipTableLock.RLock()
+	defer u.ipTableLock.RUnlock()
 	return len(u.ipTable)
 }
 
@@ -86,9 +87,12 @@ func (u *User) GetIPLimit() int {
 }
 
 func (u *User) AddTraffic(sent, recv int) {
-	if u.sendLimiter != nil && sent != 0 {
+	u.limiterLock.Lock()
+	defer u.limiterLock.Unlock()
+
+	if u.sendLimiter != nil && sent >= 0 {
 		u.sendLimiter.WaitN(u.ctx, sent)
-	} else if u.recvLimiter != nil && recv != 0 {
+	} else if u.recvLimiter != nil && recv >= 0 {
 		u.recvLimiter.WaitN(u.ctx, recv)
 	}
 	atomic.AddUint64(&u.sent, uint64(sent))
@@ -96,6 +100,9 @@ func (u *User) AddTraffic(sent, recv int) {
 }
 
 func (u *User) SetSpeedLimit(send, recv int) {
+	u.limiterLock.Lock()
+	defer u.limiterLock.Unlock()
+
 	if send <= 0 {
 		u.sendLimiter = nil
 	} else {
@@ -109,6 +116,9 @@ func (u *User) SetSpeedLimit(send, recv int) {
 }
 
 func (u *User) GetSpeedLimit() (send, recv int) {
+	u.limiterLock.RLock()
+	defer u.limiterLock.RUnlock()
+
 	sendLimit := 0
 	recvLimit := 0
 	if u.sendLimiter != nil {
@@ -159,8 +169,8 @@ func (u *User) speedUpdater() {
 }
 
 func (u *User) GetSpeed() (uint64, uint64) {
-	u.speedLock.Lock()
-	defer u.speedLock.Unlock()
+	u.speedLock.RLock()
+	defer u.speedLock.RUnlock()
 	return u.sendSpeed, u.recvSpeed
 }
 
diff --git a/statistic/memory/memory_test.go b/statistic/memory/memory_test.go
index 8d735ff20..a8a71419b 100644
--- a/statistic/memory/memory_test.go
+++ b/statistic/memory/memory_test.go
@@ -76,10 +76,8 @@ func TestMemoryAuth(t *testing.T) {
 	go func() {
 		for {
 			k := 100
-			select {
-			case <-time.After(time.Second / time.Duration(k)):
-				user.AddTraffic(200/k, 100/k)
-			}
+			time.Sleep(time.Second / time.Duration(k))
+			user.AddTraffic(200/k, 100/k)
 		}
 	}()
 	time.Sleep(time.Second * 4)