diff --git a/toolbox/task.go b/toolbox/task.go
index 537de428..abd411c8 100644
--- a/toolbox/task.go
+++ b/toolbox/task.go
@@ -389,6 +389,10 @@ func dayMatches(s *Schedule, t time.Time) bool {
 
 // StartTask start all tasks
 func StartTask() {
+	if isstart {
+		//If already started， no need to start another goroutine.
+		return
+	}
 	isstart = true
 	go run()
 }
@@ -432,8 +436,11 @@ func run() {
 
 // StopTask stop all tasks
 func StopTask() {
-	isstart = false
-	stop <- true
+	if isstart {
+		isstart = false
+		stop <- true
+	}
+
 }
 
 // AddTask add task with name