diff --git a/tests/Feature/AdminPlatformOrderIndexFullUrlWithQueryKeepsBackTest.php b/tests/Feature/AdminPlatformOrderIndexFullUrlWithQueryKeepsBackTest.php
new file mode 100644
index 0000000..6251550
--- /dev/null
+++ b/tests/Feature/AdminPlatformOrderIndexFullUrlWithQueryKeepsBackTest.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderIndexFullUrlWithQueryKeepsBackTest 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_summary_links_should_keep_back_query_when_present(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $back = '/admin/site-subscriptions?status=activated&keyword=test';
+
+        $res = $this->get('/admin/platform-orders?back=' . urlencode($back));
+        $res->assertOk();
+
+        $html = $res->getContent();
+
+        // 选一个稳定存在的 fullUrlWithQuery 链接：支付状态=已支付
+        // 断言它仍然携带 back（且 back 原始值中包含 &，因此最终 href 中应包含 back=%2F...%26...）
+        preg_match_all('/href="([^"]+)"/', $html, $matches);
+        $hrefs = $matches[1] ?? [];
+
+        $found = false;
+        foreach ($hrefs as $u) {
+            if (!str_contains($u, '/admin/platform-orders')) {
+                continue;
+            }
+            if (!str_contains($u, 'payment_status=paid')) {
+                continue;
+            }
+
+            $parts = parse_url($u);
+            parse_str($parts['query'] ?? '', $q);
+
+            if (($q['payment_status'] ?? null) === 'paid' && ($q['back'] ?? null) === $back) {
+                $found = true;
+                break;
+            }
+        }
+
+        $this->assertTrue($found, '未找到携带 back 的 payment_status=paid 链接（fullUrlWithQuery 可能丢失 back）');
+    }
+}