diff --git a/app/Http/Controllers/Admin/PlatformOrderController.php b/app/Http/Controllers/Admin/PlatformOrderController.php
index 906f949..ec067c3 100644
--- a/app/Http/Controllers/Admin/PlatformOrderController.php
+++ b/app/Http/Controllers/Admin/PlatformOrderController.php
@@ -40,6 +40,8 @@ class PlatformOrderController extends Controller
             'remark' => (string) $request->query('remark', ''),
             // back：用于创建成功后回到来源页（例如订阅详情）
             'back' => (string) $request->query('back', ''),
+            // 线索联动：用于从开通线索进入下单页，需透传到 form hidden input
+            'lead_id' => (int) $request->query('lead_id', 0),
         ];
 
         // back 安全阀：必须为站内相对路径，并拒绝引号/尖括号。
diff --git a/resources/views/admin/platform_orders/form.blade.php b/resources/views/admin/platform_orders/form.blade.php
index 1f32fcd..89d2fad 100644
--- a/resources/views/admin/platform_orders/form.blade.php
+++ b/resources/views/admin/platform_orders/form.blade.php
@@ -30,6 +30,8 @@
 
     <input type="hidden" name="site_subscription_id" value="{{ old('site_subscription_id', $defaults['site_subscription_id'] ?? '') }}">
 
+    <input type="hidden" name="lead_id" value="{{ old('lead_id', $defaults['lead_id'] ?? '') }}">
+
     @php
         $backVal = (string) old('back', $defaults['back'] ?? '');
     @endphp
diff --git a/tests/Feature/AdminPlatformOrderCreateShouldKeepLeadIdTest.php b/tests/Feature/AdminPlatformOrderCreateShouldKeepLeadIdTest.php
new file mode 100644
index 0000000..e91413d
--- /dev/null
+++ b/tests/Feature/AdminPlatformOrderCreateShouldKeepLeadIdTest.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformLead;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Arr;
+use Tests\TestCase;
+
+class AdminPlatformOrderCreateShouldKeepLeadIdTest 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_create_should_render_hidden_lead_id_input_when_present_in_query(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $plan = Plan::query()->create([
+            'code' => 'lead_id_create_order_plan',
+            'name' => '下单页lead_id透传测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $lead = PlatformLead::query()->create([
+            'name' => 'lead_id线索',
+            'mobile' => '13800000005',
+            'email' => 'lead5@example.com',
+            'company' => 'lead_id公司',
+            'source' => 'test',
+            'status' => 'new',
+            'plan_id' => $plan->id,
+            'meta' => ['merchant_id' => $merchant->id],
+        ]);
+
+        $url = '/admin/platform-orders/create?' . Arr::query([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'lead_id' => $lead->id,
+            'back' => '/admin/platform-leads',
+        ]);
+
+        $res = $this->get($url);
+        $res->assertOk();
+
+        $res->assertSee('name="lead_id"', false);
+        $res->assertSee('value="' . $lead->id . '"', false);
+    }
+}