diff --git a/app/Http/Controllers/Mobile/OtherController.php b/app/Http/Controllers/Mobile/OtherController.php
index 81c4595..40bf84a 100755
--- a/app/Http/Controllers/Mobile/OtherController.php
+++ b/app/Http/Controllers/Mobile/OtherController.php
@@ -140,24 +140,27 @@ class OtherController extends CommonController
         $sortName = $all['sort_name'] ?? 'distance';
         $sortType = $all['sort_type'] ?? 'asc';
 
-        // 使用标准的 Haversine 公式计算距离
+        // 使用更稳定的距离计算公式
         $distanceFormula = "
-            (6371 * acos(
-                cos(radians(?)) *
-                cos(radians(CAST(company_latitude AS DECIMAL(10,8)))) *
-                cos(radians(CAST(company_longitude AS DECIMAL(10,8))) - radians(?)) +
-                sin(radians(?)) *
-                sin(radians(CAST(company_latitude AS DECIMAL(10,8))))
+            (6371 * 2 * asin(
+                sqrt(
+                    pow(sin(radians((CAST(company_latitude AS DECIMAL(10,8)) - ?) / 2)), 2) +
+                    cos(radians(?)) * cos(radians(CAST(company_latitude AS DECIMAL(10,8)))) *
+                    pow(sin(radians((CAST(company_longitude AS DECIMAL(10,8)) - ?) / 2)), 2)
+                )
             )) AS distance
         ";
 
         $query = Company::with('users')
             ->whereHas('users', function ($query) {
-                $query->where('is_schoolmate', 1)->with(['courseSigns' => function ($query) {
-                    $query->with('course.typeDetail')->orderBy('fee_status', 'desc');
-                }]);
-            })->select('*')
-            ->selectRaw($distanceFormula, [$latitude, $longitude, $latitude])
+                $query->where('is_schoolmate', 1)->with([
+                    'courseSigns' => function ($query) {
+                        $query->with('course')->orderBy('fee_status', 'desc');
+                    }
+                ]);
+            })
+            ->select('*')
+            ->selectRaw($distanceFormula, [$latitude, $latitude, $longitude])
             ->where(function ($query) use ($all) {
                 if (isset($all['company_name'])) {
                     $query->where('company_name', 'like', '%' . $all['company_name'] . '%');