diff --git a/backend/app/service/ApprovalService.php b/backend/app/service/ApprovalService.php
index 93c938c..39ae0e1 100644
--- a/backend/app/service/ApprovalService.php
+++ b/backend/app/service/ApprovalService.php
@@ -77,6 +77,11 @@ class ApprovalService
                 throw new \Exception('当前状态无法审批');
             }
 
+            // 确保 notificationService 已初始化
+            if (!$this->notificationService) {
+                $this->notificationService = new FeishuNotificationService();
+            }
+
             $currentNodeIds = $order->current_nodes ?? [];
             error_log("🔍 当前节点 IDs: " . json_encode($currentNodeIds));