diff --git a/resources/views/admin/platform_orders/show.blade.php b/resources/views/admin/platform_orders/show.blade.php
index bb2d30d..353300b 100644
--- a/resources/views/admin/platform_orders/show.blade.php
+++ b/resources/views/admin/platform_orders/show.blade.php
@@ -205,6 +205,10 @@
         $expectedCents = (int) round($expectedPaid * 100);
         $markPaidBlockedByRefund = $refundTotal > 0;
 
+        // 安全阀：续费单必须绑定订阅（后端已阻断，这里做前端提示/禁用）
+        $markPaidBlockedByMissingSubscriptionOnRenewal = ((string) ($order->order_type ?? '') === 'renewal')
+            && ((int) ($order->site_subscription_id ?? 0) <= 0);
+
         $tol = (float) config('saasshop.amounts.tolerance', 0.01);
         $tolCents = (int) round($tol * 100);
         $tolCents = max(1, $tolCents);
@@ -215,10 +219,10 @@
     <div class="actions mt-16 gap-12">
         <form method="post" action="/admin/platform-orders/{{ $order->id }}/mark-paid-and-activate" onsubmit="return confirm('确认将该订单标记为已支付并生效？此操作会推进状态并尝试同步订阅');">
             @csrf
-            <button class="btn btn-sm" type="submit" @disabled(! $canMarkPaid || $markPaidBlockedByRefund || $markPaidBlockedByReceiptMismatch)>标记支付并生效</button>
+            <button class="btn btn-sm" type="submit" @disabled(! $canMarkPaid || $markPaidBlockedByRefund || $markPaidBlockedByReceiptMismatch || $markPaidBlockedByMissingSubscriptionOnRenewal)>标记支付并生效</button>
         </form>
 
-        @if($markPaidBlockedByRefund || $markPaidBlockedByReceiptMismatch)
+        @if($markPaidBlockedByRefund || $markPaidBlockedByReceiptMismatch || $markPaidBlockedByMissingSubscriptionOnRenewal)
             <div class="card governance-block">
                 <div class="muted text-danger governance-block-title"><strong>BMPA 治理提示</strong>（当前不建议/不可直接标记支付并生效）</div>
                 <div class="muted governance-block-body">
@@ -229,6 +233,13 @@
                             <a class="btn btn-secondary btn-sm" href="#refund-receipts">去核对退款</a>
                         </div>
                     @endif
+                    @if($markPaidBlockedByMissingSubscriptionOnRenewal)
+                        <div>
+                            原因：当前订单类型为「续费」，但未绑定订阅（site_subscription_id 为空）。
+                            <span class="muted">｜</span>
+                            <span class="muted">请先补齐订阅关联后再处理。</span>
+                        </div>
+                    @endif
                     @if($markPaidBlockedByReceiptMismatch)
                         <div>
                             原因：当前订单已存在支付回执，但回执总额与订单金额不一致。
diff --git a/tests/Feature/AdminPlatformOrderShowMarkPaidAndActivateButtonDisabledWhenRenewalMissingSubscriptionTest.php b/tests/Feature/AdminPlatformOrderShowMarkPaidAndActivateButtonDisabledWhenRenewalMissingSubscriptionTest.php
new file mode 100644
index 0000000..59d92bf
--- /dev/null
+++ b/tests/Feature/AdminPlatformOrderShowMarkPaidAndActivateButtonDisabledWhenRenewalMissingSubscriptionTest.php
@@ -0,0 +1,70 @@
+<?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 AdminPlatformOrderShowMarkPaidAndActivateButtonDisabledWhenRenewalMissingSubscriptionTest 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_show_should_disable_mark_paid_and_activate_button_when_renewal_order_missing_subscription(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'po_show_bmpa_disable_renewal_no_sub_plan',
+            'name' => '订单详情 BMPA 按钮禁用（续费无订阅）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_BMPA_DISABLE_RENEW_NO_SUB_0001',
+            'order_type' => 'renewal',
+            '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' => [],
+        ]);
+
+        $res = $this->get('/admin/platform-orders/' . $order->id);
+        $res->assertOk();
+
+        // 按钮应被禁用（disabled）
+        $res->assertSee('标记支付并生效', false);
+        $res->assertSee('disabled', false);
+
+        // 治理提示应出现
+        $res->assertSee('续费', false);
+        $res->assertSee('未绑定订阅', false);
+        $res->assertSee('BMPA 治理提示', false);
+    }
+}