diff --git a/app/Models/CourseSign.php b/app/Models/CourseSign.php
index 78933d2..29b3633 100755
--- a/app/Models/CourseSign.php
+++ b/app/Models/CourseSign.php
@@ -179,7 +179,7 @@ class CourseSign extends SoftDeletesModel
     public static function yhInvestedTotal($start_date = null, $end_date = null, $course_ids, $retList = false)
     {
         // 默认时间：获取所有学员，不限制课程
-        $userIds = self::getStudentList($start_date, $end_date, 1, null)->get()->pluck('user_id');
+        $userIds = self::getStudentList(null, null, 1, null)->get()->pluck('user_id');
 
         // 获取这些学员所在的被投企业
         $companies = Company::whereHas('users', function ($query) use ($userIds) {