diff --git a/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx b/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx
index bd82047a3..d2255e2b5 100644
--- a/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasBasicGenerationComposerView.tsx
@@ -14,7 +14,6 @@ import {
   PlatformFloatingMenuItem,
 } from '../common/PlatformFloatingMenu';
 import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
-import { PlatformTextField } from '../common/PlatformTextField';
 import type {
   CharacterReferenceImage,
   GenerateDialogState,
@@ -270,13 +269,11 @@ export function ImageCanvasBasicGenerationComposerView({
         />
         {dialog.mode === 'scene' &&
         dialog.sceneStylePreset === CUSTOM_EDITOR_SCENE_STYLE_PRESET ? (
-          <PlatformTextField
+          <AutoGrowTextArea
             aria-label="自定义画风"
             value={dialog.sceneCustomStyle ?? ''}
             disabled={dialog.status === 'generating'}
             placeholder="填写自定义画风，例如：90 年代复古像素风"
-            size="sm"
-            density="compact"
             className="image-canvas-editor__scene-custom-style"
             onChange={(event) =>
               setGenerateDialog((currentDialog) =>
diff --git a/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx b/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
index cc543a9f2..82424a46b 100644
--- a/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
+++ b/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
@@ -176,7 +176,11 @@ describe('ImageCanvasGenerationComposerView', () => {
     });
 
     const panel = screen.getByRole('dialog', { name: '游戏场景生成器' });
-    expect(within(panel).getByRole('textbox', { name: '画面内容' })).toBeTruthy();
+    const sceneContent = within(panel).getByRole('textbox', {
+      name: '画面内容',
+    });
+    expect(sceneContent.className).toContain('auto-grow-text-area');
+    expect(sceneContent.className).not.toContain('platform-text-field');
     expect(
       within(panel).getByRole('button', { name: '画风预设 日系动画' }),
     ).toBeTruthy();
@@ -186,6 +190,29 @@ describe('ImageCanvasGenerationComposerView', () => {
     expect(within(panel).queryByText('像素艺术')).toBeNull();
   });
 
+  it('让场景自定义画风使用可自增长的多行字段', () => {
+    renderComposer({
+      mode: 'scene',
+      prompt: '',
+      status: 'idle',
+      composerOpen: true,
+      generationReferences: [],
+      sceneStylePreset: 'custom',
+      sceneCustomStyle: '',
+      imageModel: 'gemini-3.1-flash-image-preview',
+      aspectRatio: '16:9',
+      imageSize: '1K',
+    });
+
+    const panel = screen.getByRole('dialog', { name: '游戏场景生成器' });
+    const customStyle = within(panel).getByRole('textbox', {
+      name: '自定义画风',
+    });
+    expect(customStyle.tagName).toBe('TEXTAREA');
+    expect(customStyle.className).toContain('auto-grow-text-area');
+    expect(customStyle.className).not.toContain('platform-text-field');
+  });
+
   it('让生成UI设计图面板复用普通图片生成面板的纵向结构', () => {
     const setGenerateDialog = vi.fn();
     renderComposer({