diff --git a/server/app/common/service/gancao/GancaoLogisticsRouteService.php b/server/app/common/service/gancao/GancaoLogisticsRouteService.php
index 941aa08f..c0e945e7 100644
--- a/server/app/common/service/gancao/GancaoLogisticsRouteService.php
+++ b/server/app/common/service/gancao/GancaoLogisticsRouteService.php
@@ -74,7 +74,14 @@ final class GancaoLogisticsRouteService
         }
 
         $result = $resp['result'];
-        $trackingNumber = trim((string) ($result['sp_order_no'] ?? ($order->tracking_number ?? '')));
+        $apiTracking = trim((string) ($result['sp_order_no'] ?? ''));
+        $localTracking = trim((string) ($order->tracking_number ?? ''));
+        // 业务订单已录快递单号时：不改用甘草返回的 sp_order_no，轨迹仍写入本地单号对应的运单记录
+        if ($localTracking !== '') {
+            $trackingNumber = mb_substr($localTracking, 0, 80);
+        } else {
+            $trackingNumber = mb_substr($apiTracking, 0, 80);
+        }
         $spName = trim((string) ($result['sp_name'] ?? ($order->gancao_shipping_name ?? '')));
         $routeList = is_array($result['route_list'] ?? null) ? $result['route_list'] : [];
 
@@ -87,7 +94,7 @@ final class GancaoLogisticsRouteService
 
         // 回写订单的快递单号 / 物流公司（如果之前空着）+ 签收时升级 fulfillment_status
         $orderDirty = false;
-        if (trim((string) $order->tracking_number) === '') {
+        if ($localTracking === '') {
             $order->tracking_number = mb_substr($trackingNumber, 0, 80);
             $orderDirty = true;
         }