diff --git a/app/Http/Controllers/Admin/PlatformOrderController.php b/app/Http/Controllers/Admin/PlatformOrderController.php
index a11ed36..9daf938 100644
--- a/app/Http/Controllers/Admin/PlatformOrderController.php
+++ b/app/Http/Controllers/Admin/PlatformOrderController.php
@@ -410,6 +410,16 @@ class PlatformOrderController extends Controller
             return redirect()->back()->with('warning', '当前订单已存在退款记录/退款汇总，请先核对退款轨迹与订单状态后再处理（不建议直接标记支付并生效）。');
         }
 
+        // 治理优先：若该订单已有回执但回执总额与应标记的已付金额不一致，不允许直接“标记支付并生效”
+        // 说明：该动作会尝试补回执并同步订阅，若原回执存在差额，直接推进可能掩盖问题
+        $receiptTotal = (float) $order->receiptTotal();
+        $expectedPaid = (float) (($order->paid_amount ?? 0) > 0 ? $order->paid_amount : $order->payable_amount);
+        $receiptCents = (int) round($receiptTotal * 100);
+        $expectedCents = (int) round($expectedPaid * 100);
+        if ($receiptCents > 0 && abs($receiptCents - $expectedCents) >= 1) {
+            return redirect()->back()->with('warning', '当前订单已存在支付回执，但回执总额与订单金额不一致。为避免带病推进，请先补齐/修正支付回执后再执行「标记支付并生效」。');
+        }
+
         // 最小状态推进：将订单标记为已支付 + 已生效，并补齐时间与金额字段
         $now = now();
         $order->payment_status = 'paid';
diff --git a/tests/Feature/AdminPlatformOrderMarkPaidAndActivateReconcileMismatchSafetyValveTest.php b/tests/Feature/AdminPlatformOrderMarkPaidAndActivateReconcileMismatchSafetyValveTest.php
new file mode 100644
index 0000000..c15b4ad
--- /dev/null
+++ b/tests/Feature/AdminPlatformOrderMarkPaidAndActivateReconcileMismatchSafetyValveTest.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderMarkPaidAndActivateReconcileMismatchSafetyValveTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_mark_paid_and_activate_blocked_when_receipt_total_mismatch_exists(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'mark_paid_receipt_mismatch_safety_valve_test',
+            'name' => '标记支付回执差额安全阀测试（月付）',
+            'billing_cycle' => 'monthly',
+            'price' => 30,
+            'list_price' => 30,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        // 已存在回执汇总，但与订单应付金额不一致
+        $order = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_MARK_PAID_RECEIPT_MISMATCH_BLOCK_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'pending',
+            'payment_status' => 'unpaid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 30,
+            'paid_amount' => 0,
+            'placed_at' => now(),
+            'meta' => [
+                'payment_summary' => [
+                    'count' => 1,
+                    'total_amount' => 29.98,
+                ],
+            ],
+        ]);
+
+        $res = $this->post('/admin/platform-orders/' . $order->id . '/mark-paid-and-activate');
+        $res->assertRedirect();
+        $res->assertSessionHas('warning');
+
+        $order->refresh();
+        $this->assertSame('unpaid', $order->payment_status);
+        $this->assertSame('pending', $order->status);
+        $this->assertNull($order->site_subscription_id);
+    }
+}