diff --git a/backend/app/controller/ApprovalController.php b/backend/app/controller/ApprovalController.php
index ea88c45..482c208 100644
--- a/backend/app/controller/ApprovalController.php
+++ b/backend/app/controller/ApprovalController.php
@@ -3,6 +3,7 @@
 namespace app\controller;
 
 use app\service\ApprovalService;
+use app\model\ApprovalOrder;
 use Webman\Http\Request;
 use Webman\Http\Response;
 
@@ -15,6 +16,18 @@ class ApprovalController extends BaseController
         $this->service = new ApprovalService();
     }
 
+    /**
+     * 获取路由参数
+     */
+    private function getRouteParam(Request $request, string $name, $default = null)
+    {
+        $route = $request->route;
+        if ($route && method_exists($route, 'param')) {
+            return $route->param($name) ?? $default;
+        }
+        return $default;
+    }
+
     /**
      * 获取审批列表
      */
@@ -35,9 +48,9 @@ class ApprovalController extends BaseController
      */
     public function detail(Request $request): Response
     {
-        $id = (int) $request->route('id');
+        $id = (int) $this->getRouteParam($request, 'id');
 
-        $approval = \App\Model\ApprovalOrder::with(['flow', 'applicant', 'records'])
+        $approval = ApprovalOrder::with(['flow', 'applicant', 'records'])
             ->findOrFail($id);
 
         return $this->success($approval);
@@ -49,7 +62,7 @@ class ApprovalController extends BaseController
     public function approve(Request $request): Response
     {
         $userId = $this->getUserId($request);
-        $id = (int) $request->route('id');
+        $id = (int) $this->getRouteParam($request, 'id');
         $data = $request->post();
         $data = $data ?? [];
         $comment = $data['comment'] ?? null;
@@ -68,7 +81,7 @@ class ApprovalController extends BaseController
     public function reject(Request $request): Response
     {
         $userId = $this->getUserId($request);
-        $id = (int) $request->route('id');
+        $id = (int) $this->getRouteParam($request, 'id');
         $data = $request->post();
         $data = $data ?? [];
         $comment = $data['comment'] ?? null;
@@ -87,7 +100,7 @@ class ApprovalController extends BaseController
     public function cancel(Request $request): Response
     {
         $userId = $this->getUserId($request);
-        $id = (int) $request->route('id');
+        $id = (int) $this->getRouteParam($request, 'id');
 
         try {
             $approval = $this->service->cancel($id, $userId);
diff --git a/backend/app/controller/BaseController.php b/backend/app/controller/BaseController.php
index eae4b86..74adf8b 100644
--- a/backend/app/controller/BaseController.php
+++ b/backend/app/controller/BaseController.php
@@ -52,7 +52,7 @@ abstract class BaseController
         }
 
         // 解析 token
-        $payload = \App\Util\JwtUtil::decode($token);
+        $payload = app\util\JwtUtil::decode($token);
         if (!$payload) {
             return null;
         }
diff --git a/backend/app/model/ApprovalNode.php b/backend/app/model/ApprovalNode.php
index 6a1ba79..72cf17f 100644
--- a/backend/app/model/ApprovalNode.php
+++ b/backend/app/model/ApprovalNode.php
@@ -26,7 +26,7 @@ class ApprovalNode extends Model
     ];
 
     /**
-     * 节点类型常量
+     * 节点类型常量（与数据库 enum 保持一致）
      */
     const TYPE_APPROVER = 'approver';       // 审批人（单人）
     const TYPE_AND_APPROVE = 'and_approve'; // 会签（需所有人通过）
@@ -76,4 +76,12 @@ class ApprovalNode extends Model
     {
         return $this->type === self::TYPE_OR_APPROVE;
     }
+
+    /**
+     * 判断是否是单人审批
+     */
+    public function isSingleApprove(): bool
+    {
+        return $this->type === self::TYPE_APPROVER;
+    }
 }
diff --git a/backend/app/service/ApprovalService.php b/backend/app/service/ApprovalService.php
index b3d775e..42c1fb8 100644
--- a/backend/app/service/ApprovalService.php
+++ b/backend/app/service/ApprovalService.php
@@ -233,7 +233,7 @@ class ApprovalService
         $node = ApprovalNode::findOrFail($nodeId);
         $records = ApprovalRecord::where('order_id', $orderId)
             ->where('node_id', $nodeId)
-            ->where('action', ApprovalRecord::ACTION_APPROVE)
+            ->where('action', 'approve')
             ->get();
 
         $approvers = $node->approvers ?? [];