diff --git a/interfaces/inner_api/file_access/BUILD.gn b/interfaces/inner_api/file_access/BUILD.gn
index 4cb4a40e59650e7cb40c6b8eac2ed91371fd047e..6ea6a1fc5404c3bc4052ba46349311295feac25d 100644
--- a/interfaces/inner_api/file_access/BUILD.gn
+++ b/interfaces/inner_api/file_access/BUILD.gn
@@ -87,6 +87,7 @@ ohos_shared_library("file_access_extension_ability_kit") {
     "bundle_framework:appexecfwk_base",
     "bundle_framework:appexecfwk_core",
     "c_utils:utils",
+    "c_utils:utilsbase",
     "file_api:filemgmt_libn",
     "hilog:libhilog",
     "hitrace:hitrace_meter",
diff --git a/interfaces/inner_api/file_access/src/file_access_ext_proxy.cpp b/interfaces/inner_api/file_access/src/file_access_ext_proxy.cpp
index d6efb18056a6690efc2bd177654f36846ca7da85..09273855d87f2024821b26a5ebe5201b5b278a13 100644
--- a/interfaces/inner_api/file_access/src/file_access_ext_proxy.cpp
+++ b/interfaces/inner_api/file_access/src/file_access_ext_proxy.cpp
@@ -572,8 +572,8 @@ static int ReadFileFilterResults(MessageParcel &reply, SharedMemoryInfo &memInfo
     return ERR_OK;
 }
 
-int FileAccessExtProxy::ListFile(const FileInfo &fileInfo, const int64_t offset, const FileFilter &filter,
-    SharedMemoryInfo &memInfo)
+int FileAccessExtProxy::ListFile(const FileInfo &fileInfo, const int64_t offset,
+    const FileFilter &filter, SharedMemoryInfo &memInfo)
 {
     UserAccessTracer trace;
     trace.Start("ListFile");
@@ -700,12 +700,12 @@ int FileAccessExtProxy::Query(const Uri &uri, std::vector<std::string> &columns,
         HILOG_ERROR("fail to WriteParcelable sourceFile");
         return E_IPCS;
     }
-    int64_t count = columns.size();
+    size_t count = columns.size();
     if (!data.WriteInt64(count)) {
         HILOG_ERROR("Parameter Query fail to WriteInt64 count");
         return E_IPCS;
     }
-    if (static_cast<size_t>(count) > FILE_RESULT_TYPE.size()) {
+    if (count > FILE_RESULT_TYPE.size()) {
         HILOG_ERROR(" The number of query operations exceeds %{public}zu ", FILE_RESULT_TYPE.size());
         return EINVAL;
     }
diff --git a/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/Common.ts b/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/Common.ts
index d8e2c59d44fb123d3c80939b2e5c77590cc9e190..6c9ef15da0dc859195bcb17a5c79e015f746d374 100644
--- a/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/Common.ts
+++ b/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/Common.ts
@@ -128,7 +128,7 @@ function encodePathOfUri(uri): string {
   }
   return uri;
 }
-
+ 
 function decodeUri(uri): string {
   try {
     uri = decodeURIComponent(uri);
diff --git a/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/FileExtensionAbility.ts b/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/FileExtensionAbility.ts
index 00e2a0399d4c2bde64aa0c41d9751b1b1c8d18f9..0a5283064047df1bc3d1d391faff099483092074 100644
--- a/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/FileExtensionAbility.ts
+++ b/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/FileExtensionAbility.ts
@@ -769,6 +769,7 @@ export default class FileExtAbility extends Extension {
         deviceType: deviceType.DEVICE_SHARED_TERMINAL,
         deviceFlags: deviceFlag.SUPPORTS_READ | deviceFlag.SUPPORTS_WRITE,
       };
+      hilog.info(DOMAIN_CODE, TAG, `df count: ${hmdfsInfo.length}`);
       hmdfsInfoList.push(hmdfsInfo);
     }
     return hmdfsInfoList;
@@ -806,7 +807,7 @@ export default class FileExtAbility extends Extension {
         volumeInfoList.push(volumeInfo);
       }
       roots = roots.concat(volumeInfoList);
-
+      hilog.info(DOMAIN_CODE, TAG, `External file count: ${volumeInfoList.length}`);
       try {
         roots = roots.concat(getHmdfsPath());
       } catch (e) {
diff --git a/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/ListScanFileInfo.ts b/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/ListScanFileInfo.ts
index b7c5e7d0f854468ea2639e00b79bf263c8883b31..03db99f845d2660f4430ac1db8012f9a02b01927 100644
--- a/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/ListScanFileInfo.ts
+++ b/services/file_extension_hap/entry/src/main/ets/FileExtensionAbility/ListScanFileInfo.ts
@@ -23,6 +23,7 @@ const documentFlag = fileExtensionInfo.DocumentFlag;
 const ERR_OK = 0;
 const E_GETRESULT = 14300004;
 const APP_DATA = 'appdata';
+const BACKUP_DIR = '.backup';
 const CURRENT_USER_PATH = '/storage/Users/currentUser';
 
 function hasFilter(filter: Filter) : boolean {
@@ -152,8 +153,8 @@ function getListFileInfos(sourceFileUri: string, offset: number, count: number,
       if (i === listNum) {
         break;
       }
-      if (path === CURRENT_USER_PATH && fileNameList[i] === APP_DATA) {
-        hilog.info(DOMAIN_CODE, TAG, `filter appdata doc`);
+      if (path === CURRENT_USER_PATH && (fileNameList[i] === APP_DATA || fileNameList[i] === BACKUP_DIR)) {
+        hilog.info(DOMAIN_CODE, TAG, `filter appdata doc or backup dir`);
         continue;
       }
       let mode = documentFlag.SUPPORTS_READ | documentFlag.SUPPORTS_WRITE;