diff --git a/pkg/lru/define.go b/pkg/lru/define.go
index 5198552..6b8dd2b 100644
--- a/pkg/lru/define.go
+++ b/pkg/lru/define.go
@@ -28,10 +28,12 @@ const (
 const (
 	defaultWaitTime = 20 * time.Minute
 )
+
 type CacheInterface interface {
 	Del() error
 	Get(key *proto.BaseKey) (structure.KeyBaseInterface, bool)
 	Add(key *proto.BaseKey, val structure.KeyBaseInterface)
 	UpdateLruSize(length structure.UpdateLength)
 	DelByKey(key *proto.BaseKey) error
+    DelToClearSize() error
 }