diff --git a/app/Http/Controllers/Api/ReplyController.php b/app/Http/Controllers/Api/ReplyController.php
index c48be42..650505c 100644
--- a/app/Http/Controllers/Api/ReplyController.php
+++ b/app/Http/Controllers/Api/ReplyController.php
@@ -41,6 +41,11 @@ public function store(Request $request, WorkOrder $workOrder)
             return $this->error('工单状态异常，无法进行回复。请尝试重新建立工单。');
         }
 
+        // 如果工单已经关闭，那么访客不能回复
+        if ($workOrder->isClosed() && !auth('sanctum')->check()) {
+            return $this->error('工单已关闭，无法进行回复。');
+        }
+
         $create = [
             'content' => $request->input('content'),
             'work_order_id' => $workOrder->id,
diff --git a/app/Http/Controllers/Api/WorkOrderController.php b/app/Http/Controllers/Api/WorkOrderController.php
index 1c935bc..64ecbdb 100644
--- a/app/Http/Controllers/Api/WorkOrderController.php
+++ b/app/Http/Controllers/Api/WorkOrderController.php
@@ -66,6 +66,11 @@ public function update(Request $request, WorkOrder $workOrder)
             'status' => 'nullable|sometimes|string|in:closed',
         ]);
 
+        // 访客不能关闭
+        if ($request->input('status') === 'closed' && !auth('sanctum')->check()) {
+            return $this->error('访客不能修改工单状态。');
+        }
+
         $workOrder->update($request->only('status'));
 
         return $this->success($workOrder);
diff --git a/app/Models/WorkOrder/WorkOrder.php b/app/Models/WorkOrder/WorkOrder.php
index 1ba5c82..2b36590 100644
--- a/app/Models/WorkOrder/WorkOrder.php
+++ b/app/Models/WorkOrder/WorkOrder.php
@@ -164,6 +164,16 @@ public function isFailure(): bool
         return $this->status === 'pending' || $this->status === 'error';
     }
 
+    public function isOpen(): bool
+    {
+        return $this->status !== 'closed' && $this->status !== 'error' && $this->status !== 'pending';
+    }
+
+    public function isClosed(): bool
+    {
+        return $this->status === 'closed';
+    }
+
     /**
      * @throws CommonException
      */