diff --git a/logdb.go b/logdb.go
index d3399e3..9bd5937 100644
--- a/logdb.go
+++ b/logdb.go
@@ -125,9 +125,6 @@ type ADResonse struct {
 }
 
 func (logdb *LogDB) ADParserSelect(spider_id int) []ADResonse {
-	logdb.mutex.Lock()
-	defer logdb.mutex.Unlock()
-
 	pid := logdb.pid + 2000
 	logdb.adCheckRecover(spider_id)