diff --git a/resources/views/admin/platform_orders/show.blade.php b/resources/views/admin/platform_orders/show.blade.php
index 6cfa865..d60c9a4 100644
--- a/resources/views/admin/platform_orders/show.blade.php
+++ b/resources/views/admin/platform_orders/show.blade.php
@@ -129,6 +129,15 @@
         $canMarkPaid = ($order->payment_status !== 'paid') || ($order->status !== 'activated');
         $syncError = data_get($order->meta, 'subscription_activation_error.message');
         $syncErrorAt = data_get($order->meta, 'subscription_activation_error.at');
+
+        // 治理提示：标记支付并生效的安全阀（后端也会阻断）
+        $refundTotal = (float) $order->refundTotal();
+        $receiptTotal = (float) $order->receiptTotal();
+        $expectedPaid = (float) (((float) ($order->paid_amount ?? 0)) > 0 ? (float) $order->paid_amount : (float) ($order->payable_amount ?? 0));
+        $receiptCents = (int) round($receiptTotal * 100);
+        $expectedCents = (int) round($expectedPaid * 100);
+        $markPaidBlockedByRefund = $refundTotal > 0;
+        $markPaidBlockedByReceiptMismatch = $receiptCents > 0 && abs($receiptCents - $expectedCents) >= 1;
     @endphp
 
     <div style="margin-top:16px; display:flex; gap:12px; flex-wrap:wrap; align-items:center;">
@@ -137,6 +146,12 @@
             <button type="submit" @disabled(! $canMarkPaid)>标记支付并生效</button>
         </form>
 
+        @if($markPaidBlockedByRefund)
+            <div class="muted text-danger" style="margin-top:6px; width:100%;">提示：当前订单已存在退款记录/退款汇总，建议先核对退款轨迹与状态后再进行「标记支付并生效」。</div>
+        @elseif($markPaidBlockedByReceiptMismatch)
+            <div class="muted text-danger" style="margin-top:6px; width:100%;">提示：当前订单已存在支付回执，但回执总额与订单金额不一致，建议先补齐/修正回执后再进行「标记支付并生效」。</div>
+        @endif
+
         <form method="post" action="/admin/platform-orders/{{ $order->id }}/activate-subscription" onsubmit="return confirm('确认同步订阅？将根据该订单创建/续期订阅');">
             @csrf
             <button type="submit" @disabled(! $canActivate || $alreadySynced)>{{ $alreadySynced ? '已同步' : '同步订阅' }}</button>
diff --git a/tests/Feature/AdminPlatformOrderShowMarkPaidGovernanceHintTest.php b/tests/Feature/AdminPlatformOrderShowMarkPaidGovernanceHintTest.php
new file mode 100644
index 0000000..d564329
--- /dev/null
+++ b/tests/Feature/AdminPlatformOrderShowMarkPaidGovernanceHintTest.php
@@ -0,0 +1,110 @@
+<?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 AdminPlatformOrderShowMarkPaidGovernanceHintTest 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_order_show_page_shows_hint_when_mark_paid_blocked_by_refund_total(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'show_mark_paid_hint_refund_test',
+            'name' => '详情页标记支付提示（退款）测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 30,
+            'list_price' => 30,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $order = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_SHOW_MARK_PAID_HINT_REFUND_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' => [
+                'refund_summary' => [
+                    'count' => 1,
+                    'total_amount' => 1.00,
+                ],
+            ],
+        ]);
+
+        $this->get('/admin/platform-orders/' . $order->id)
+            ->assertOk()
+            ->assertSee('已存在退款记录/退款汇总', false);
+    }
+
+    public function test_order_show_page_shows_hint_when_mark_paid_blocked_by_receipt_mismatch(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'show_mark_paid_hint_receipt_test',
+            'name' => '详情页标记支付提示（回执差额）测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 30,
+            'list_price' => 30,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $order = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_SHOW_MARK_PAID_HINT_RECEIPT_0002',
+            '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,
+                ],
+            ],
+        ]);
+
+        $this->get('/admin/platform-orders/' . $order->id)
+            ->assertOk()
+            ->assertSee('已存在支付回执，但回执总额与订单金额不一致', false);
+    }
+}