diff --git a/app/Http/Controllers/Business/Pages.php b/app/Http/Controllers/Business/Pages.php
index a3687288..b0e9c258 100644
--- a/app/Http/Controllers/Business/Pages.php
+++ b/app/Http/Controllers/Business/Pages.php
@@ -549,7 +549,7 @@ class Pages extends Controller
             || ! checkdate((int) $matches[2], 1, (int) $matches[1])) {
             $month = now()->startOfMonth()->subMonth()->format('Y-m');
         }
-        $minimumMonth = substr(ThirdPartyWarehouseStorageMirrorRepository::START_DATE, 0, 7);
+        $minimumMonth = substr(ThirdPartyWarehouseStorageMirrorRepository::INVENTORY_REPORT_START_DATE, 0, 7);
         if ($month < $minimumMonth) {
             $month = $minimumMonth;
         }
diff --git a/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php b/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
index e1686a83..5ef5bd60 100644
--- a/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
+++ b/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
@@ -61,7 +61,7 @@ class ThirdPartyWarehouseStorageMirrorRepository
     public const START_DATE = '2026-08-01';
 
     /** Historical monthly report range can start one month before the flow page. */
-    private const INVENTORY_REPORT_START_DATE = '2026-07-01';
+    public const INVENTORY_REPORT_START_DATE = '2026-07-01';
 
     /** @var array<string,string> */
     private const MOVEMENT_COLUMNS = [
diff --git a/resources/views/business/pages/partials/directory-table.blade.php b/resources/views/business/pages/partials/directory-table.blade.php
index a940a7ca..fc634323 100644
--- a/resources/views/business/pages/partials/directory-table.blade.php
+++ b/resources/views/business/pages/partials/directory-table.blade.php
@@ -456,7 +456,7 @@
             <form method="GET" action="{{ request()->url() }}" class="installation-filter-bar" aria-label="进销存报表筛选查询栏">
                 <label class="installation-filter-field">
                     <span>月份：</span>
-                    <input type="month" name="month" min="2026-08" value="{{ request('month', now()->startOfMonth()->subMonth()->format('Y-m')) }}" aria-label="进销存报表月份">
+                    <input type="month" name="month" min="2026-07" value="{{ request('month', now()->startOfMonth()->subMonth()->format('Y-m')) }}" aria-label="进销存报表月份">
                 </label>
                 <label class="installation-filter-field">
                     <span>商品编码：</span>
diff --git a/tests/Feature/Business/PagesTest.php b/tests/Feature/Business/PagesTest.php
index b8e7fb0a..0224d076 100644
--- a/tests/Feature/Business/PagesTest.php
+++ b/tests/Feature/Business/PagesTest.php
@@ -51,6 +51,37 @@ class PagesTest extends FeatureTestCase
             ])), false);
     }
 
+    public function testInventoryReportKeepsJulyMonthFilter(): void
+    {
+        $repository = Mockery::mock(ThirdPartyWarehouseStorageMirrorRepository::class);
+        $repository->shouldReceive('available')->once()->andReturnTrue();
+        $repository->shouldReceive('allWarehousesReady')->once()->andReturnTrue();
+        $repository->shouldReceive('paginateMonthlyInventoryReport')->once()->with(
+            [
+                'month' => '2026-07',
+                'product_code' => '',
+                'warehouse_provider' => '',
+                'category' => '',
+            ],
+            1,
+            Mockery::type('int'),
+        )->andReturn([
+            'data' => [],
+            'total' => 0,
+            'state' => ['status' => 'succeeded'],
+            'sync' => ['code' => 'healthy'],
+        ]);
+        $this->app->instance(ThirdPartyWarehouseStorageMirrorRepository::class, $repository);
+
+        $this->loginAs()->get(route('business.pages.show', [
+            'section' => 'product-inventory',
+            'page' => 'inventory-report',
+            'month' => '2026-07',
+        ]))->assertOk()
+            ->assertSee('min="2026-07"', false)
+            ->assertSee('value="2026-07"', false);
+    }
+
     public function testInventoryReportExportUsesCurrentFiltersAndPageColumnOrder(): void
     {
         $filters = [