diff --git a/kernel/model/assets.go b/kernel/model/assets.go
index bb07f0b7a..add83cead 100644
--- a/kernel/model/assets.go
+++ b/kernel/model/assets.go
@@ -419,7 +419,7 @@ func RemoveUnusedAssets() (ret []string) {
 		}
 	}
 
-	sql.DeleteAssetsByHashes(hashes)
+	sql.BatchRemoveAssetsQueue(hashes)
 
 	for _, unusedAsset := range unusedAssets {
 		if unusedAsset = filepath.Join(util.DataDir, unusedAsset); gulu.File.IsExist(unusedAsset) {
@@ -458,7 +458,7 @@ func RemoveUnusedAsset(p string) (ret string) {
 		}
 
 		hash, _ := util.GetEtag(absPath)
-		sql.DeleteAssetsByHashes([]string{hash})
+		sql.BatchRemoveAssetsQueue([]string{hash})
 	}
 
 	if err = os.RemoveAll(absPath); nil != err {
diff --git a/kernel/sql/asset.go b/kernel/sql/asset.go
index b5abebbf9..072829d09 100644
--- a/kernel/sql/asset.go
+++ b/kernel/sql/asset.go
@@ -92,14 +92,10 @@ func docTitleImgAsset(root *ast.Node) *Asset {
 	return nil
 }
 
-func DeleteAssetsByHashes(hashes []string) {
+func deleteAssetsByHashes(tx *sql.Tx, hashes []string) (err error) {
 	sqlStmt := "DELETE FROM assets WHERE hash IN ('" + strings.Join(hashes, "','") + "') OR hash = ''"
-	tx, err := beginTx()
-	if nil != err {
-		return
-	}
-	execStmtTx(tx, sqlStmt)
-	commitTx(tx)
+	err = execStmtTx(tx, sqlStmt)
+	return
 }
 
 func QueryAssetByHash(hash string) (ret *Asset) {
diff --git a/kernel/sql/queue.go b/kernel/sql/queue.go
index 6a9b22c1d..6026007d4 100644
--- a/kernel/sql/queue.go
+++ b/kernel/sql/queue.go
@@ -41,7 +41,7 @@ var (
 
 type dbQueueOperation struct {
 	inQueueTime time.Time
-	action      string // upsert/delete/delete_id/rename/delete_box/delete_box_refs/insert_refs/index/delete_ids/update_block_content
+	action      string // upsert/delete/delete_id/rename/delete_box/delete_box_refs/insert_refs/index/delete_ids/update_block_content/delete_assets
 
 	indexPath                     string      // index
 	upsertTree                    *parse.Tree // upsert/insert_refs
@@ -52,6 +52,7 @@ type dbQueueOperation struct {
 	renameTree                    *parse.Tree // rename
 	renameTreeOldHPath            string      // rename
 	block                         *Block      // update_block_content
+	removeAssetHashes             []string    // delete_assets
 }
 
 func FlushTxJob() {
@@ -169,6 +170,8 @@ func execOp(op *dbQueueOperation, tx *sql.Tx, context map[string]interface{}) (e
 		err = upsertRefs(tx, op.upsertTree)
 	case "update_block_content":
 		err = updateBlockContent(tx, op.block)
+	case "delete_assets":
+		err = deleteAssetsByHashes(tx, op.removeAssetHashes)
 	default:
 		msg := fmt.Sprintf("unknown operation [%s]", op.action)
 		logging.LogErrorf(msg)
@@ -177,6 +180,14 @@ func execOp(op *dbQueueOperation, tx *sql.Tx, context map[string]interface{}) (e
 	return
 }
 
+func BatchRemoveAssetsQueue(hashes []string) {
+	dbQueueLock.Lock()
+	defer dbQueueLock.Unlock()
+
+	newOp := &dbQueueOperation{removeAssetHashes: hashes, inQueueTime: time.Now(), action: "delete_assets"}
+	operationQueue = append(operationQueue, newOp)
+}
+
 func UpdateBlockContentQueue(block *Block) {
 	dbQueueLock.Lock()
 	defer dbQueueLock.Unlock()
@@ -336,4 +347,4 @@ func mergeUpsertTrees() (ops []*dbQueueOperation) {
 	ops = operationQueue
 	operationQueue = nil
 	return
-}
\ No newline at end of file
+}