diff --git a/frontend/src/pages/ai-assistant/ChatTab.tsx b/frontend/src/pages/ai-assistant/ChatTab.tsx
index 61447b6..d11bc30 100644
--- a/frontend/src/pages/ai-assistant/ChatTab.tsx
+++ b/frontend/src/pages/ai-assistant/ChatTab.tsx
@@ -238,7 +238,7 @@ export function ChatTab() {
   }
 
   return (
-    <div className="flex flex-col" style={{ height: 'calc(100vh - 220px)', minHeight: '400px' }}>
+    <div className="flex flex-col" style={{ height: 'calc(100vh - 250px)', minHeight: '400px' }}>
       {/* 顶部操作栏 */}
       <div className="flex items-center gap-2 pb-2 border-b">
         <Button size="sm" variant="secondary" onClick={newConversation}><Plus className="w-4 h-4 mr-1" />新对话</Button>