diff --git a/resources/views/business/pages/partials/directory-table.blade.php b/resources/views/business/pages/partials/directory-table.blade.php
index 74047a0e..d9b09d89 100644
--- a/resources/views/business/pages/partials/directory-table.blade.php
+++ b/resources/views/business/pages/partials/directory-table.blade.php
@@ -26,6 +26,7 @@
     // 字段配置里带 group 的目录表按 Excel 样式渲染两层合并表头：同组字段共用一个一级标题，
     // 未分组的列标题跨两行显示，列顺序固定为配置顺序。
     $directoryHasGroupedHeader = collect($directoryFields)->contains(fn (array $field): bool => filled($field['group'] ?? null));
+    $directoryLastFieldName = collect($directoryFields)->last()['name'] ?? null;
     $directoryIsPaginated = is_object($directoryRows) && method_exists($directoryRows, 'total');
     $directoryTotal = $directoryIsPaginated ? $directoryRows->total() : (is_countable($directoryRows) ? count($directoryRows) : 0);
     $directoryCurrentPage = $directoryIsPaginated ? $directoryRows->currentPage() : 1;
@@ -503,6 +504,15 @@
     .directory-table[data-grouped-header] thead th[data-directory-group] {
         font-weight: 700;
     }
+    /* 两层表头里每一行的最后一个单元格不一定位于表格最右侧，基础样式的
+       th:last-child 会连中间列的右边框一起去掉，右侧跨行一级标题就会断格。
+       这里按字段顺序给真正的最后一列打标记，只让它在表格右边缘不留边框。 */
+    .directory-table[data-grouped-header] thead th {
+        border-right: 1px solid var(--vip-border, #d8d2c7);
+    }
+    .directory-table[data-grouped-header] thead th[data-directory-last-column] {
+        border-right: 0;
+    }
     .directory-table[data-grouped-header] th:first-child,
     .directory-table[data-grouped-header] td:first-child {
         min-width: 8rem;
@@ -1340,7 +1350,7 @@
                             @foreach ($groupedHeaderRuns as $headerRun)
                                 @if ($headerRun['group'] === null)
                                     @foreach ($headerRun['fields'] as $field)
-                                        <th scope="col" rowspan="2" data-column-key="{{ $field['name'] }}" class="{{ in_array($field['kind'] ?? null, ['number', 'integer'], true) ? 'is-number' : '' }} {{ !in_array($field['name'], $visibleDirectoryColumns, true) ? 'is-column-hidden' : '' }}">{{ $field['label'] }}</th>
+                                        <th scope="col" rowspan="2" data-column-key="{{ $field['name'] }}" @if($field['name'] === $directoryLastFieldName) data-directory-last-column @endif class="{{ in_array($field['kind'] ?? null, ['number', 'integer'], true) ? 'is-number' : '' }} {{ !in_array($field['name'], $visibleDirectoryColumns, true) ? 'is-column-hidden' : '' }}">{{ $field['label'] }}</th>
                                     @endforeach
                                 @else
                                     <th scope="col" colspan="{{ count($headerRun['fields']) }}" data-directory-group="{{ $headerRun['group'] }}">{{ $headerRun['group'] }}</th>
@@ -1379,7 +1389,7 @@
                         <tr>
                             @foreach ($directoryFields as $field)
                                 @continue(!isset($field['group']))
-                                <th scope="col" data-column-key="{{ $field['name'] }}" data-directory-group-leaf="{{ $field['group'] }}" class="{{ in_array($field['kind'] ?? null, ['number', 'integer'], true) ? 'is-number' : '' }} {{ !in_array($field['name'], $visibleDirectoryColumns, true) ? 'is-column-hidden' : '' }}">{{ $field['label'] }}</th>
+                                <th scope="col" data-column-key="{{ $field['name'] }}" data-directory-group-leaf="{{ $field['group'] }}" @if($field['name'] === $directoryLastFieldName) data-directory-last-column @endif class="{{ in_array($field['kind'] ?? null, ['number', 'integer'], true) ? 'is-number' : '' }} {{ !in_array($field['name'], $visibleDirectoryColumns, true) ? 'is-column-hidden' : '' }}">{{ $field['label'] }}</th>
                             @endforeach
                         </tr>
                     @endif
diff --git a/tests/Feature/Settings/NavigationTest.php b/tests/Feature/Settings/NavigationTest.php
index d5e8d6af..d122ea03 100644
--- a/tests/Feature/Settings/NavigationTest.php
+++ b/tests/Feature/Settings/NavigationTest.php
@@ -72,6 +72,9 @@ class NavigationTest extends FeatureTestCase
             ->assertSee('rowspan="2"', false)
             ->assertSee('colspan="5"', false)
             ->assertSee('colspan="3"', false)
+            // 两层表头里第二行的最后一个单元格不在表格最右侧，需要保留右边框，
+            // 否则右侧跨行一级标题列会和左侧分组列断格。
+            ->assertSee('data-directory-last-column', false)
             // 工作表没有序号列，页面也不再渲染固定序号列。
             ->assertDontSee('<th scope="col" data-directory-fixed="start"', false)
             ->assertDontSee('<td data-directory-fixed="start"', false)