diff --git a/tests/Feature/AdminPlatformBatchShowPageSpotCheckLinkBackShouldIncludeSpotAfterIdWhenPresentTest.php b/tests/Feature/AdminPlatformBatchShowPageSpotCheckLinkBackShouldIncludeSpotAfterIdWhenPresentTest.php
new file mode 100644
index 0000000..0c73302
--- /dev/null
+++ b/tests/Feature/AdminPlatformBatchShowPageSpotCheckLinkBackShouldIncludeSpotAfterIdWhenPresentTest.php
@@ -0,0 +1,118 @@
+<?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 AdminPlatformBatchShowPageSpotCheckLinkBackShouldIncludeSpotAfterIdWhenPresentTest 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_batch_show_page_spot_check_link_back_should_include_spot_after_id_when_present(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'plan_batch_spot_back_after_id_0001',
+            'name' => '批次页抽样复核 back 包含 spot_after_id 护栏测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $runId = 'BMPA_SPOT_BACK_AFTER_ID_0001';
+
+        $orderA = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BMPA_SPOT_BACK_AFTER_ID_A',
+            'order_type' => 'new_purchase',
+            '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()->subMinutes(11),
+            'paid_at' => now()->subMinutes(10),
+            'activated_at' => now()->subMinutes(9),
+            'meta' => [
+                'batch_mark_paid_and_activate' => [
+                    'run_id' => $runId,
+                    'last_result' => [
+                        'run_id' => $runId,
+                        'success' => 2,
+                        'failed' => 0,
+                        'matched' => 2,
+                        'processed' => 2,
+                        'top_reasons' => [],
+                        'at' => now()->toDateTimeString(),
+                    ],
+                ],
+            ],
+        ]);
+
+        $orderB = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BMPA_SPOT_BACK_AFTER_ID_B',
+            'order_type' => 'new_purchase',
+            '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()->subMinutes(8),
+            'paid_at' => now()->subMinutes(7),
+            'activated_at' => now()->subMinutes(6),
+            'meta' => [
+                'batch_mark_paid_and_activate' => [
+                    'run_id' => $runId,
+                    'last_result' => [
+                        'run_id' => $runId,
+                        'success' => 2,
+                        'failed' => 0,
+                        'matched' => 2,
+                        'processed' => 2,
+                        'top_reasons' => [],
+                        'at' => now()->toDateTimeString(),
+                    ],
+                ],
+            ],
+        ]);
+
+        // spot_after_id=orderB 将抽样切换到更早的 orderA
+        $html = $this->get('/admin/platform-batches/show?type=bmpa&run_id=' . $runId . '&spot_after_id=' . $orderB->id)
+            ->assertOk()
+            ->getContent();
+
+        $expectedBack = '/admin/platform-batches/show?type=bmpa&run_id=' . $runId . '&spot_after_id=' . $orderB->id;
+
+        $this->assertStringContainsString('data-role="batch-spot-check-link"', $html);
+        $this->assertStringContainsString('/admin/platform-orders/' . $orderA->id, $html);
+        $this->assertStringContainsString('back=' . urlencode($expectedBack), $html);
+    }
+}