diff --git a/apps/ai-game-creator-shell/src/view/ui-editor/index.tsx b/apps/ai-game-creator-shell/src/view/ui-editor/index.tsx
index de1f21527..16b53de8a 100644
--- a/apps/ai-game-creator-shell/src/view/ui-editor/index.tsx
+++ b/apps/ai-game-creator-shell/src/view/ui-editor/index.tsx
@@ -101,7 +101,7 @@ export default function UiEditorPage({
       return Boolean(
         (target instanceof HTMLElement && target.isContentEditable) ||
           element?.closest(
-            'button, a, input, textarea, select, [contenteditable="true"], [role="button"]',
+            'button, a, input, textarea, select, [contenteditable="true"], [role="button"], [role="dialog"], [aria-modal="true"]',
           ),
       );
     };
diff --git a/apps/ai-game-creator-shell/tests/uiEditorPage.test.ts b/apps/ai-game-creator-shell/tests/uiEditorPage.test.ts
index e55cb9fcd..2c4206167 100644
--- a/apps/ai-game-creator-shell/tests/uiEditorPage.test.ts
+++ b/apps/ai-game-creator-shell/tests/uiEditorPage.test.ts
@@ -514,6 +514,34 @@ describe('UiEditorPage', () => {
     await waitFor(() => expect(screen.queryByText('page-child')).toBeNull());
   });
 
+  it('does not delete a selected node when Delete originates inside a dialog', async () => {
+    const state = stateWithPages(['page']);
+    state.ui_trees[0]!.root.children = [node('page-child')];
+    const stateStore: IUiDesignStateStore = {
+      load: vi.fn().mockResolvedValue({ revision: 0, state }),
+      save: vi.fn(),
+      generateCode: vi.fn().mockRejectedValue(new Error('测试未配置代码生成')),
+    };
+
+    render(
+      createElement(UiEditorPage, {
+        projectPath: '/tmp/ui-editor-delete-dialog',
+        resourceId: 'ui-resource',
+        stateStore,
+      }),
+    );
+
+    const child = await screen.findByText('page-child');
+    fireEvent.click(child);
+    const dialog = document.createElement('div');
+    dialog.setAttribute('role', 'dialog');
+    document.body.appendChild(dialog);
+    fireEvent.keyDown(dialog, { key: 'Delete' });
+
+    expect(screen.queryAllByText('page-child').length).toBeGreaterThan(0);
+    dialog.remove();
+  });
+
   it('keeps Inspector status highlighting separate from node navigation', async () => {
     const { result } = await renderLoadedSession(stateWithPages(['page']));
     const rootId = 'page-root';
diff --git a/docs/【UI编辑器】撤销重做规范-2026-09-03.md b/docs/【UI编辑器】撤销重做规范-2026-09-03.md
index 9efab4673..bd4b6abaa 100644
--- a/docs/【UI编辑器】撤销重做规范-2026-09-03.md
+++ b/docs/【UI编辑器】撤销重做规范-2026-09-03.md
@@ -51,6 +51,7 @@ UI 编辑器支持撤销最近一次或多次作品编辑，并支持重做被
 - `input`、`textarea`、`select`、`contenteditable` 等文本编辑控件交给浏览器原生行为，不拦截文本撤销；按钮/链接等非文本控件仍允许编辑器撤销/重做快捷键生效。
 - UI Editor 页面内选中节点后，支持不带修饰键的 `Delete` 删除节点及其子节点；快捷键复用 Inspector、树面板和右键菜单共用的 `deleteNode` 命令，因此沿用根节点/锁定禁删、单条历史记录、dirty 标记和后续保存语义。
 - `Delete` / `Backspace` 在 `input`、`textarea`、`select`、`contenteditable`、按钮和链接等交互控件聚焦时交给浏览器原生行为；无选中、根节点、锁定或目标不存在时不执行删除。长按重复事件不重复删除，成功处理后阻止默认行为和事件冒泡。
+- `Delete` / `Backspace` 在打开的对话框（`role="dialog"` 或 `aria-modal="true"`）内聚焦时交给对话框处理，不删除对话框背后的节点。
 - 无可撤销或重做记录时按钮禁用，并提供可访问名称。
 
 ## 脏状态与选择