diff --git a/apps/web/src/pages/generate/hooks/useStep4Title/useTitleStyleUpdaters.ts b/apps/web/src/pages/generate/hooks/useStep4Title/useTitleStyleUpdaters.ts
index 49ef2685d..da50abba3 100644
--- a/apps/web/src/pages/generate/hooks/useStep4Title/useTitleStyleUpdaters.ts
+++ b/apps/web/src/pages/generate/hooks/useStep4Title/useTitleStyleUpdaters.ts
@@ -5,6 +5,8 @@ import type { TitleSettings } from "../../types"
 interface UseTitleStyleUpdatersOptions {
   titleSettings: TitleSettings
   onTitleSettingsChange: (settings: TitleSettings) => void
+  /** AI 自动生成标题函数（由 useStep4Title 从 aiGenerator 注入） */
+  autoGenerateTitle?: () => string
 }
 
 /**
@@ -14,6 +16,7 @@ interface UseTitleStyleUpdatersOptions {
 export function useTitleStyleUpdaters({
   titleSettings,
   onTitleSettingsChange,
+  autoGenerateTitle,
 }: UseTitleStyleUpdatersOptions) {
   /** 匹配预设：只用 color/bold/italic/stroke/shadow，不再匹配 size */
   const getActivePreset = (settings: TitleSettings): string | null => {
@@ -41,8 +44,17 @@ export function useTitleStyleUpdaters({
   )
 
   const toggleAiAutoSelect = useCallback(() => {
-    onTitleSettingsChange({ ...titleSettings, aiAutoSelect: !titleSettings.aiAutoSelect })
-  }, [titleSettings, onTitleSettingsChange])
+    if (!titleSettings.aiAutoSelect) {
+      // 打开开关：自动生成标题
+      if (autoGenerateTitle) {
+        autoGenerateTitle()
+      }
+    }
+    onTitleSettingsChange({
+      ...titleSettings,
+      aiAutoSelect: !titleSettings.aiAutoSelect,
+    })
+  }, [titleSettings, onTitleSettingsChange, autoGenerateTitle])
 
   const updatePosition = useCallback(
     (position: string) => {