diff --git a/app/Http/Controllers/Mobile/OtherController.php b/app/Http/Controllers/Mobile/OtherController.php
index 994cbad..cefa431 100755
--- a/app/Http/Controllers/Mobile/OtherController.php
+++ b/app/Http/Controllers/Mobile/OtherController.php
@@ -140,26 +140,33 @@ class OtherController extends CommonController
         $sortName = $all['sort_name'] ?? 'distance';
         $sortType = $all['sort_type'] ?? 'asc';
 
-        // 使用更稳定的距离计算公式
+        // 使用简单稳定的距离计算公式
         $distanceFormula = "
-            (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)
-                )
+            (6371 * acos(
+                GREATEST(-1, LEAST(1, 
+                    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))))
+                ))
             )) AS distance
         ";
 
-        $query = Company::with(['users' => function ($query) {
-            $query->with(['courseSigns' => function ($query) {
-                    $query->with('course')->orderBy('fee_status', 'desc');
-                }
-            ]);
-        }])->whereHas('users', function ($query) {
-            $query->where('is_schoolmate', 1);
-        })->select('*')
-            ->selectRaw($distanceFormula, [$latitude, $latitude, $longitude])
+        $query = Company::with([
+            'users' => function ($query) {
+                $query->with([
+                    'courseSigns' => function ($query) {
+                        $query->with('course')->orderBy('fee_status', 'desc');
+                    }
+                ]);
+            }
+        ])
+            ->whereHas('users', function ($query) {
+                $query->where('is_schoolmate', 1);
+            })
+            ->select('*')
+            ->selectRaw($distanceFormula, [$latitude, $longitude, $latitude])
             ->where(function ($query) use ($all) {
                 if (isset($all['company_name'])) {
                     $query->where('company_name', 'like', '%' . $all['company_name'] . '%');