diff --git a/tests/Feature/AdminPlatformOrderExportTest.php b/tests/Feature/AdminPlatformOrderExportTest.php
index c4afcb8..e6681b4 100644
--- a/tests/Feature/AdminPlatformOrderExportTest.php
+++ b/tests/Feature/AdminPlatformOrderExportTest.php
@@ -136,6 +136,66 @@ class AdminPlatformOrderExportTest extends TestCase
         $content3 = $res3->streamedContent();
         $this->assertStringContainsString('PO_EXPORT_BATCH_RECENT', $content3);
         $this->assertStringNotContainsString('PO_EXPORT_BATCH_OLD', $content3);
+
+        // site_subscription_id 精确过滤导出：只导出订阅ID命中的订单
+        $sub = \App\Models\SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'status' => 'activated',
+            'source' => 'manual',
+            'subscription_no' => 'SUB_EXPORT_FILTER_0001',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'amount' => 10,
+            'starts_at' => now()->subDay(),
+            'ends_at' => now()->addMonth(),
+            'activated_at' => now()->subDay(),
+        ]);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'site_subscription_id' => $sub->id,
+            'order_no' => 'PO_EXPORT_SUB_FILTER_0001',
+            'order_type' => 'renewal',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+        ]);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'site_subscription_id' => null,
+            'order_no' => 'PO_EXPORT_SUB_FILTER_0002',
+            'order_type' => 'renewal',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+        ]);
+
+        $res4 = $this->get('/admin/platform-orders/export?site_subscription_id=' . $sub->id);
+        $res4->assertOk();
+        $content4 = $res4->streamedContent();
+        $this->assertStringContainsString('PO_EXPORT_SUB_FILTER_0001', $content4);
+        $this->assertStringNotContainsString('PO_EXPORT_SUB_FILTER_0002', $content4);
     }
 
     public function test_guest_cannot_export_platform_orders_csv(): void