diff --git a/tests/Feature/AdminSiteSubscriptionShowOrderSyncStatusFilterLinksKeepBackTest.php b/tests/Feature/AdminSiteSubscriptionShowOrderSyncStatusFilterLinksKeepBackTest.php
new file mode 100644
index 0000000..abbd581
--- /dev/null
+++ b/tests/Feature/AdminSiteSubscriptionShowOrderSyncStatusFilterLinksKeepBackTest.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\SiteSubscription;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminSiteSubscriptionShowOrderSyncStatusFilterLinksKeepBackTest 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_page_order_sync_status_filter_links_should_keep_back_and_not_escape_ampersand(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $sub = SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'status' => 'activated',
+            'source' => 'manual',
+            'subscription_no' => 'SUB_SHOW_FILTER_BACK_0001',
+            'plan_name' => '测试套餐',
+            'billing_cycle' => 'monthly',
+            'period_months' => 1,
+            'amount' => 10,
+            'starts_at' => now()->subDay(),
+            'ends_at' => now()->addDays(29),
+            'activated_at' => now()->subDay(),
+        ]);
+
+        $back = '/admin/platform-orders?status=pending&keyword=abc';
+        $expectedBack = urlencode($back);
+
+        $res = $this->get('/admin/site-subscriptions/' . $sub->id . '?back=' . $expectedBack);
+        $res->assertOk();
+
+        // “全部”应保留 back
+        $res->assertSee('href="/admin/site-subscriptions/' . $sub->id . '?back=' . $expectedBack . '"', false);
+
+        // “可同步”应同时带 back + order_sync_status，且 & 不应被 escape 成 &amp;
+        $res->assertSee('href="/admin/site-subscriptions/' . $sub->id . '?back=' . $expectedBack . '&order_sync_status=syncable"', false);
+        $res->assertDontSee('back=' . $expectedBack . '&amp;order_sync_status=syncable', false);
+    }
+}