diff --git a/cache/cache_test.go b/cache/cache_test.go
index 1e71d075..470c0a43 100644
--- a/cache/cache_test.go
+++ b/cache/cache_test.go
@@ -16,10 +16,33 @@ package cache
 
 import (
 	"os"
+	"sync"
 	"testing"
 	"time"
 )
 
+func TestCacheIncr(t *testing.T) {
+	bm, err := NewCache("memory", `{"interval":20}`)
+	if err != nil {
+		t.Error("init err")
+	}
+	//timeoutDuration := 10 * time.Second
+
+	bm.Put("edwardhey", 0, time.Second*20)
+	wg := sync.WaitGroup{}
+	wg.Add(10)
+	for i := 0; i < 10; i++ {
+		go func() {
+			defer wg.Done()
+			bm.Incr("edwardhey")
+		}()
+	}
+	wg.Wait()
+	if bm.Get("edwardhey").(int) != 10 {
+		t.Error("Incr err")
+	}
+}
+
 func TestCache(t *testing.T) {
 	bm, err := NewCache("memory", `{"interval":20}`)
 	if err != nil {
diff --git a/cache/memory.go b/cache/memory.go
index e5b562f0..1fec2eff 100644
--- a/cache/memory.go
+++ b/cache/memory.go
@@ -110,8 +110,8 @@ func (bc *MemoryCache) Delete(name string) error {
 // Incr increase cache counter in memory.
 // it supports int,int32,int64,uint,uint32,uint64.
 func (bc *MemoryCache) Incr(key string) error {
-	bc.RLock()
-	defer bc.RUnlock()
+	bc.Lock()
+	defer bc.Unlock()
 	itm, ok := bc.items[key]
 	if !ok {
 		return errors.New("key not exist")
@@ -137,8 +137,8 @@ func (bc *MemoryCache) Incr(key string) error {
 
 // Decr decrease counter in memory.
 func (bc *MemoryCache) Decr(key string) error {
-	bc.RLock()
-	defer bc.RUnlock()
+	bc.Lock()
+	defer bc.Unlock()
 	itm, ok := bc.items[key]
 	if !ok {
 		return errors.New("key not exist")