diff --git a/packages/backend/src/cloud/drivers/quark-ad-cleanup.ts b/packages/backend/src/cloud/drivers/quark-ad-cleanup.ts
index 9309a8c..19068ea 100644
--- a/packages/backend/src/cloud/drivers/quark-ad-cleanup.ts
+++ b/packages/backend/src/cloud/drivers/quark-ad-cleanup.ts
@@ -166,12 +166,13 @@ async function batchDeleteFiles(
 export async function createWarningDirectories(
   cookie: string,
   dirNames: string[],
+  parentDirFid: string = "0",
 ): Promise<void> {
   if (!dirNames.length) return;
 
   // 先获取根目录下所有文件夹，避免重复创建
   await humanDelay();
-  const rootFiles = await listDirAllPages(cookie, "0");
+  const rootFiles = await listDirAllPages(cookie, parentDirFid);
   const existingDirs = new Set(
     rootFiles.filter((f) => f.dir).map((f) => f.file_name),
   );
@@ -192,7 +193,7 @@ export async function createWarningDirectories(
       continue;
     }
 
-    await createSingleDir(cookie, formattedName);
+    await createSingleDir(cookie, formattedName, parentDirFid);
     // 加入已存在集合，防止同名重试
     existingDirs.add(formattedName);
   }
@@ -204,6 +205,7 @@ export async function createWarningDirectories(
 async function createSingleDir(
   cookie: string,
   dirName: string,
+  pdirFid: string = "0",
 ): Promise<boolean> {
   try {
     const resp = await fetch(
@@ -215,7 +217,7 @@ async function createSingleDir(
           "Content-Type": "application/json",
         },
         body: JSON.stringify({
-          pdir_fid: "0",
+          pdir_fid: pdirFid,
           file_name: dirName,
           dir: true,
           dir_path: "",
@@ -276,7 +278,7 @@ export async function runAdCleanup(
     console.log(
       `[Quark-AdCleanup] 开始创建警示文件夹: ${warningNames.length} 个`,
     );
-    await createWarningDirectories(cookie, warningNames);
+    await createWarningDirectories(cookie, warningNames, savedDirFid);
     warningDirs = warningNames.length;
     console.log(
       `[Quark-AdCleanup] 警示文件夹创建完成（共 ${warningDirs} 个）`,