diff --git a/cache/memory.go b/cache/memory.go
index 2ad1da06..4980b9aa 100644
--- a/cache/memory.go
+++ b/cache/memory.go
@@ -30,16 +30,16 @@ var (
 // MemoryItem store enery cache item.
 type MemoryItem struct {
 	val        interface{}
-	Lastaccess time.Time
-	expired    int64
+	cratedTime time.Time
+	lifespan   int64
 }
 
 func (mi *MemoryItem) isExpire() bool {
-	// expired==0 means never
-	if mi.expired == 0 {
+	// 0 means forever
+	if mi.lifespan == 0 {
 		return false
 	}
-	return time.Now().Unix()-mi.Lastaccess.Unix() > mi.expired
+	return time.Now().Unix()-mi.cratedTime.Unix() > mi.lifespan
 }
 
 // MemoryCache is Memory cache adapter.
@@ -89,8 +89,8 @@ func (bc *MemoryCache) Put(name string, value interface{}, expired int64) error
 	defer bc.Unlock()
 	bc.items[name] = &MemoryItem{
 		val:        value,
-		Lastaccess: time.Now(),
-		expired:    expired,
+		cratedTime: time.Now(),
+		lifespan:    expired,
 	}
 	return nil
 }