diff --git a/components/ChatInputBox/ChatInputBox.tsx b/components/ChatInputBox/ChatInputBox.tsx
index 64d0573..04e219e 100644
--- a/components/ChatInputBox/ChatInputBox.tsx
+++ b/components/ChatInputBox/ChatInputBox.tsx
@@ -175,7 +175,7 @@ export function ChatInputBox({ noData }: { noData: boolean }) {
     language: "english",
     videoDuration: "unlimited",
     expansion_mode: true,
-    aspect_ratio: "VIDEO_ASPECT_RATIO_LANDSCAPE",
+    aspect_ratio: isMobile ? "VIDEO_ASPECT_RATIO_PORTRAIT" : "VIDEO_ASPECT_RATIO_LANDSCAPE",
   });
 
   // 从 localStorage 初始化配置
@@ -190,19 +190,38 @@ export function ChatInputBox({ noData }: { noData: boolean }) {
           language: parsed.language || "english",
           videoDuration: parsed.videoDuration || "unlimited",
           expansion_mode: typeof parsed.expansion_mode === 'boolean' ? parsed.expansion_mode : true,
-          aspect_ratio: parsed.aspect_ratio || "VIDEO_ASPECT_RATIO_LANDSCAPE",
+          aspect_ratio: parsed.aspect_ratio || (isMobile ? "VIDEO_ASPECT_RATIO_PORTRAIT" : "VIDEO_ASPECT_RATIO_LANDSCAPE"),
         });
       } catch (error) {
         console.warn('解析保存的配置失败，使用默认配置:', error);
       }
     }
-  }, []);
+  }, [isMobile]);
+
+  // 跟踪用户是否手动修改过宽高比
+  const [hasUserChangedAspectRatio, setHasUserChangedAspectRatio] = useState(false);
+
+  // 监听设备类型变化，仅在用户未手动修改时动态调整默认宽高比
+  useEffect(() => {
+    if (!hasUserChangedAspectRatio) {
+      setConfigOptions(prev => ({
+        ...prev,
+        aspect_ratio: isMobile ? "VIDEO_ASPECT_RATIO_PORTRAIT" : "VIDEO_ASPECT_RATIO_LANDSCAPE"
+      }));
+    }
+  }, [isMobile, hasUserChangedAspectRatio]);
 
   const onConfigChange = <K extends keyof ConfigOptions>(key: K, value: ConfigOptions[K]) => {
     setConfigOptions((prev: ConfigOptions) => ({
       ...prev,
       [key]: value,
     }));
+    
+    // 如果用户手动修改了宽高比，标记为已修改
+    if (key === 'aspect_ratio') {
+      setHasUserChangedAspectRatio(true);
+    }
+    
     if (key === 'videoDuration') {
       // 当选择 8s 时，强制关闭剧本扩展并禁用开关
       if (value === '8s') {
diff --git a/components/ChatInputBox/H5PhotoStoryDrawer.tsx b/components/ChatInputBox/H5PhotoStoryDrawer.tsx
index b13e0d4..2e46551 100644
--- a/components/ChatInputBox/H5PhotoStoryDrawer.tsx
+++ b/components/ChatInputBox/H5PhotoStoryDrawer.tsx
@@ -80,7 +80,7 @@ export const H5PhotoStoryDrawer = ({
 
   const { loadingText } = useLoadScriptText(isLoading);
   const [localLoading, setLocalLoading] = useState(0);
-  const [aspectUI, setAspectUI] = useState<AspectRatioValue>("VIDEO_ASPECT_RATIO_LANDSCAPE");
+  const [aspectUI, setAspectUI] = useState<AspectRatioValue>("VIDEO_ASPECT_RATIO_PORTRAIT");
   const router = useRouter();
   const taskProgressRef = useRef(taskProgress);
   const [cursorPosition, setCursorPosition] = useState(0);
diff --git a/components/ChatInputBox/H5TemplateDrawer.tsx b/components/ChatInputBox/H5TemplateDrawer.tsx
index 176ad32..5d0b843 100644
--- a/components/ChatInputBox/H5TemplateDrawer.tsx
+++ b/components/ChatInputBox/H5TemplateDrawer.tsx
@@ -79,7 +79,7 @@ export const H5TemplateDrawer = ({
   const [isDescExpanded, setIsDescExpanded] = useState(false);
   // 自由输入框布局
   const [freeInputLayout, setFreeInputLayout] = useState('bottom');
-  const [aspectUI, setAspectUI] = useState<AspectRatioValue>("VIDEO_ASPECT_RATIO_LANDSCAPE");
+  const [aspectUI, setAspectUI] = useState<AspectRatioValue>("VIDEO_ASPECT_RATIO_PORTRAIT");
   // 顶部列表所在的实际滚动容器（外层 top-section 才是滚动容器）
   const topSectionRef = useRef<HTMLDivElement | null>(null);