diff --git a/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/UiTreeRenderer.tsx b/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/UiTreeRenderer.tsx
index 006971164..18cee0ab6 100644
--- a/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/UiTreeRenderer.tsx
+++ b/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/UiTreeRenderer.tsx
@@ -125,7 +125,7 @@ function RenderNode({
   return (
     <div
       data-node-id={node.id}
-      className={`absolute min-h-0 min-w-0 ${isRoot ? 'cursor-default' : 'cursor-move'}`}
+      className={`absolute min-h-0 min-w-0 select-none ${isRoot ? 'cursor-default' : 'cursor-move'}`}
       style={{
         ...geometry,
         ...(parentContainer
diff --git a/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/useNodeTransformInteraction.ts b/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/useNodeTransformInteraction.ts
index 991083160..fe7edab39 100644
--- a/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/useNodeTransformInteraction.ts
+++ b/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/useNodeTransformInteraction.ts
@@ -190,6 +190,7 @@ export function useNodeTransformInteraction({
       const dragNode =
         selectedNode && selectedNode.id !== tree?.root.id ? selectedNode : node;
       if (!isFiniteTransform(dragNode.layout.transform)) return;
+      event.preventDefault();
       event.stopPropagation();
       event.currentTarget.setPointerCapture(event.pointerId);
       suppressNextNodeClickRef.current = false;
diff --git a/apps/ai-game-creator-shell/tests/uiEditorPreview.test.tsx b/apps/ai-game-creator-shell/tests/uiEditorPreview.test.tsx
index bd5ac2ade..855bac497 100644
--- a/apps/ai-game-creator-shell/tests/uiEditorPreview.test.tsx
+++ b/apps/ai-game-creator-shell/tests/uiEditorPreview.test.tsx
@@ -88,6 +88,16 @@ function renderTree(
 }
 
 describe('UI tree preview visibility', () => {
+  it('disables native text selection on preview node layers', () => {
+    const rendered = renderTree('editor-overlay', new Set());
+
+    expect(
+      rendered.container
+        .querySelector('[data-node-id="child"]')
+        ?.classList.contains('select-none'),
+    ).toBe(true);
+  });
+
   it('does not use click alone to select directly draggable nodes', () => {
     const onSelectNode = vi.fn();
     const rendered = renderTree('editor-overlay', new Set(), { onSelectNode });
diff --git a/apps/ai-game-creator-shell/tests/useNodeTransformInteraction.test.tsx b/apps/ai-game-creator-shell/tests/useNodeTransformInteraction.test.tsx
index 7b794fc2c..d6d854eb4 100644
--- a/apps/ai-game-creator-shell/tests/useNodeTransformInteraction.test.tsx
+++ b/apps/ai-game-creator-shell/tests/useNodeTransformInteraction.test.tsx
@@ -119,6 +119,18 @@ function renderInteraction({
 }
 
 describe('useNodeTransformInteraction', () => {
+  it('prevents the browser default when starting a node drag', () => {
+    const { result } = renderInteraction();
+    const target = gestureTarget();
+    const event = pointerEvent(target, 1, 0, 0);
+
+    act(() => {
+      result.current.onNodePointerDown(event, child);
+    });
+
+    expect(event.preventDefault).toHaveBeenCalledTimes(1);
+  });
+
   it('moves the current selection when dragging another node', () => {
     const selected = node('selected');
     const treeWithSelection: UITree = {
diff --git a/docs/technical/【技术方案】UI编辑器Godot容器布局模型-2026-08-18.md b/docs/technical/【技术方案】UI编辑器Godot容器布局模型-2026-08-18.md
index af2afcbf9..d6f828055 100644
--- a/docs/technical/【技术方案】UI编辑器Godot容器布局模型-2026-08-18.md
+++ b/docs/technical/【技术方案】UI编辑器Godot容器布局模型-2026-08-18.md
@@ -42,3 +42,5 @@ Container 专属数据是互斥 tagged union：HBox/VBox 存 `alignment + separa
 布局只在 Inspector 编辑。Preview 不为 Container 管理的 child 提供拖拽或缩放手柄；Inspector 会提示其 Transform 被父 Container 忽略。普通 Control 仍保留原 Transform 编辑和自由预览操作。
 
 Preview 的节点选择采用“松开确认”语义：节点或调整手柄按下时只建立指针手势，不立即改变选择；沿用现有 `2px` 屏幕位移阈值（达到阈值即视为拖动），未达到阈值且在预览区域内松开时才选择按下命中的节点，发生拖动、取消、失焦或在区域外松开均不选择。发生拖动时，Transform 更新作用于按下前已选中的节点；没有当前选择时才回退到按下节点。拖动外层节点时，嵌套 child 产生的后续 click 也不得重新选择；未发生拖动时，嵌套 child 仍按实际命中节点选择。
+
+预览节点层禁止浏览器原生文字选择；拖动手势开始时阻止默认行为，避免 pointer drag 被浏览器解释为文本选取。