diff --git a/app/common/service/SendMsgCronJobService.php b/app/common/service/SendMsgCronJobService.php
index 45dc67a..3ddcdf4 100644
--- a/app/common/service/SendMsgCronJobService.php
+++ b/app/common/service/SendMsgCronJobService.php
@@ -575,7 +575,8 @@ class SendMsgCronJobService
     {
         try {
             $teacher_schedule_time = TeacherScheduleTime::where(['is_publish' => 1])
-                ->whereTime('start_time', '<=', date('Y-m-d H:i:s', strtotime('+10 minute')))
+                ->whereTime('start_time', '>=', date('Y-m-d H:i:s', strtotime('+10 minute')))
+                ->whereTime('start_time', '<=', date('Y-m-d H:i:s', strtotime('+11 minute')))
                 ->with(['teacherAttr', 'subject', 'studentSchedule'])
                 ->select();