diff --git a/pkg/content/bucket.go b/pkg/content/bucket.go
index 40186f64..ed9c6cca 100644
--- a/pkg/content/bucket.go
+++ b/pkg/content/bucket.go
@@ -25,6 +25,7 @@ var (
 	bucketKeyObjectContent = []byte("content")
 	bucketKeyObjectBlob    = []byte("blob")
 	bucketKeyObjectLeases  = []byte("leases")
+	bucketKeyObjectLabels  = []byte("labels")
 
 	bucketKeyVersion   = []byte("v1")
 	bucketKeyNamespace = []byte(accelerationServiceNamespace)
diff --git a/pkg/content/content.go b/pkg/content/content.go
index 2b3c90d2..97b8a9f2 100644
--- a/pkg/content/content.go
+++ b/pkg/content/content.go
@@ -122,6 +122,7 @@ func (content *Content) GC(ctx context.Context) error {
 // cleanLeases use lease to manage content blob, delete lease of content which should be gc
 func (content *Content) cleanLeases(ctx context.Context, size int64) error {
 	ls, err := content.lm.List(ctx)
+	fmt.Println(len(ls))
 	if err != nil {
 		return nil
 	}
@@ -136,6 +137,7 @@ func (content *Content) cleanLeases(ctx context.Context, size int64) error {
 				return err
 			}
 			size -= blobsize
+			fmt.Println(size)
 			return nil
 		}); err != nil {
 			return err
@@ -148,6 +150,7 @@ func (content *Content) cleanLeases(ctx context.Context, size int64) error {
 		}
 	}
 	ls, err = content.lm.List(ctx)
+	fmt.Println(len(ls))
 	if err != nil {
 		return nil
 	}
@@ -222,5 +225,23 @@ func (content *Content) Abort(ctx context.Context, ref string) error {
 }
 
 func (content *Content) Writer(ctx context.Context, opts ...content.WriterOpt) (content.Writer, error) {
-	return content.store.Writer(ctx, opts...)
+	writer, err := content.store.Writer(ctx, opts...)
+	if err := content.db.Update(func(tx *bolt.Tx) error {
+		bucket := getBlobsBucket(tx)
+		// if can't find blob bucket, it maens content store is empty
+		if bucket == nil {
+			return nil
+		}
+		return bucket.ForEach(func(key, value []byte) error {
+			if subBucket := bucket.Bucket(key); subBucket != nil {
+				if subBucket.Bucket(bucketKeyObjectLabels) != nil {
+					return subBucket.DeleteBucket(bucketKeyObjectLabels)
+				}
+			}
+			return nil
+		})
+	}); err != nil {
+		return nil, err
+	}
+	return writer, err
 }