diff --git a/WebSite/src/App.tsx b/WebSite/src/App.tsx
index ea15097..a79f59d 100644
--- a/WebSite/src/App.tsx
+++ b/WebSite/src/App.tsx
@@ -30,7 +30,6 @@ import {
   FolderOpen,
   Server,
   AlertCircle,
-  Eye,
   Info,
   X
 } from 'lucide-react';
@@ -464,27 +463,42 @@ export default function App() {
     showToast('密码更新成功');
   };
 
-  const handleUpdatePreview = async () => {
-    setIsPreviewLoading(true);
-    try {
-      const data = await apiRequest('/api/preview', {
-        method: 'POST',
-        body: JSON.stringify({
-          inputDir: selectedInputDir,
-          angleDegrees: cervicalRotation
-        })
-      });
-      setPreviewImage(data.image);
-      setBackendOnline(true);
-      setBackendMessage('预览已由 head_extension_app.py 生成');
-      showToast('预览已更新');
-    } catch (error) {
-      setBackendOnline(false);
-      showToast((error as Error).message);
-    } finally {
-      setIsPreviewLoading(false);
-    }
-  };
+  useEffect(() => {
+    if (currentPage !== 'workspace' || !selectedInputDir) return;
+
+    const controller = new AbortController();
+    const timer = window.setTimeout(async () => {
+      setIsPreviewLoading(true);
+      try {
+        const response = await fetch(`${API_BASE}/api/preview`, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({
+            inputDir: selectedInputDir,
+            angleDegrees: cervicalRotation
+          }),
+          signal: controller.signal
+        });
+        const data = await response.json();
+        if (!response.ok) throw new Error(data.error || '预览生成失败');
+        setPreviewImage(data.image);
+        setBackendOnline(true);
+        setBackendMessage('预览已自动更新');
+      } catch (error) {
+        if ((error as Error).name !== 'AbortError') {
+          setBackendOnline(false);
+          setBackendMessage((error as Error).message);
+        }
+      } finally {
+        if (!controller.signal.aborted) setIsPreviewLoading(false);
+      }
+    }, 300);
+
+    return () => {
+      controller.abort();
+      window.clearTimeout(timer);
+    };
+  }, [currentPage, selectedInputDir, cervicalRotation]);
 
   const handleRunSimulation = async () => {
     if (isSimulating) return;
@@ -694,11 +708,8 @@ export default function App() {
                     </div>
                   </div>
 
-                  <div className="grid grid-cols-2 gap-3">
-                    <button onClick={handleUpdatePreview} disabled={isPreviewLoading || !selectedInputDir} className="py-3 bg-slate-900 text-white rounded-xl text-xs font-bold hover:bg-slate-700 transition-all flex items-center justify-center gap-2 active:scale-95 disabled:opacity-50">
-                      <Eye size={14} /> {isPreviewLoading ? '预览中' : '更新预览'}
-                    </button>
-                    <button onClick={handleRunSimulation} disabled={isSimulating || !selectedInputDir} className="py-3 bg-blue-600 text-white rounded-xl text-xs font-bold hover:bg-blue-700 transition-all flex items-center justify-center gap-2 active:scale-95 disabled:opacity-50">
+                  <div>
+                    <button onClick={handleRunSimulation} disabled={isSimulating || !selectedInputDir} className="w-full py-3 bg-blue-600 text-white rounded-xl text-xs font-bold hover:bg-blue-700 transition-all flex items-center justify-center gap-2 active:scale-95 disabled:opacity-50">
                       <PlayIcon className="fill-white" size={14} /> {isSimulating ? '生成中' : '四状态输出'}
                     </button>
                   </div>
@@ -774,7 +785,10 @@ export default function App() {
                       <h4 className="font-black text-slate-800">快速 2D 预览</h4>
                       <p className="text-[10px] text-slate-400 font-bold mt-1">对应 head_extension_app.py 的 preview_deform_2d</p>
                     </div>
-                    <span className="text-[10px] font-mono text-slate-400">{cervicalRotation.toFixed(1)} DEG</span>
+                    <div className="text-right">
+                      <span className="text-[10px] font-mono text-slate-400">{cervicalRotation.toFixed(1)} DEG</span>
+                      {isPreviewLoading && <p className="text-[9px] font-bold text-blue-500 mt-1">自动更新中...</p>}
+                    </div>
                   </div>
                   <div className="h-[360px] bg-slate-950 flex items-center justify-center">
                     {previewImage ? (
@@ -782,7 +796,7 @@ export default function App() {
                     ) : (
                       <div className="text-center text-slate-500">
                         <ImageIcon size={42} className="mx-auto mb-3 opacity-40" />
-                        <p className="text-xs font-bold">点击“更新预览”读取影像库 DICOM</p>
+                        <p className="text-xs font-bold">{isPreviewLoading ? '正在自动生成预览...' : '选择影像库数据后自动生成预览'}</p>
                       </div>
                     )}
                   </div>