diff --git a/app/Models/CourseSign.php b/app/Models/CourseSign.php
index 66ac99a..5cb2a47 100755
--- a/app/Models/CourseSign.php
+++ b/app/Models/CourseSign.php
@@ -176,7 +176,7 @@ class CourseSign extends SoftDeletesModel
      * @param array|null $course_ids 课程ID（仅在自定义时间时生效）
      * @param bool $retList 是否返回列表
      */
-    public static function yhInvestedTotal($start_date, $end_date = null, $retList = false)
+    public static function yhInvestedTotal($start_date = null, $end_date = null, $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');
@@ -190,14 +190,26 @@ class CourseSign extends SoftDeletesModel
         $filteredCompanies = [];
         foreach ($companies as $company) {
             $projectUsers = $company->project_users ?? [];
+            $hasValidInvestDate = false;
+            $allInvestDatesNull = true;
+
             foreach ($projectUsers as $item) {
                 $investDate = $item['investDate'] ?? null;
-                // 检查被投时间是否在范围内
-                if ($investDate && $investDate <= $end_date) {
-                    $filteredCompanies[] = $company;
-                    break; // 只要有一条满足就加入
+                // 检查是否有有效的被投时间
+                if ($investDate) {
+                    $allInvestDatesNull = false;
+                    // 检查被投时间是否在范围内
+                    if ($investDate <= $end_date) {
+                        $hasValidInvestDate = true;
+                        break; // 只要有一条满足就加入
+                    }
                 }
             }
+
+            // 如果有有效的被投时间在范围内，或者所有被投时间都是null，则加入结果
+            if ($hasValidInvestDate || $allInvestDatesNull) {
+                $filteredCompanies[] = $company;
+            }
         }
         $companies = collect($filteredCompanies);