diff --git a/kernel/model/file.go b/kernel/model/file.go
index fb9b77265..567db8110 100644
--- a/kernel/model/file.go
+++ b/kernel/model/file.go
@@ -187,7 +187,7 @@ func SearchDocsByKeyword(keyword string, flashcard bool) (ret []map[string]strin
 			}
 		}
 
-		rootBlocks = sql.QueryRootBlockByCondition(condition)
+		rootBlocks = sql.QueryRootBlockByCondition(condition, Conf.Search.Limit)
 	} else {
 		for _, box := range boxes {
 			if flashcard {
diff --git a/kernel/sql/block_query.go b/kernel/sql/block_query.go
index 578f4300a..2ba4f645b 100644
--- a/kernel/sql/block_query.go
+++ b/kernel/sql/block_query.go
@@ -69,8 +69,8 @@ func queryBlockHashes(rootID string) (ret map[string]string) {
 	return
 }
 
-func QueryRootBlockByCondition(condition string) (ret []*Block) {
-	sqlStmt := "SELECT *, length(hpath) - length(replace(hpath, '/', '')) AS lv FROM blocks WHERE type = 'd' AND " + condition + " ORDER BY box DESC,lv ASC LIMIT 128"
+func QueryRootBlockByCondition(condition string, limit int) (ret []*Block) {
+	sqlStmt := "SELECT *, length(hpath) - length(replace(hpath, '/', '')) AS lv FROM blocks WHERE type = 'd' AND " + condition + " ORDER BY box DESC,lv ASC LIMIT " + strconv.Itoa(limit)
 	rows, err := query(sqlStmt)
 	if err != nil {
 		logging.LogErrorf("sql query [%s] failed: %s", sqlStmt, err)