diff --git a/services/native/file_access_service/include/file_access_service.h b/services/native/file_access_service/include/file_access_service.h
index b70b92226d7c6af1426433f80d5a400ad7d589ae..26831de997fd146c584efde83f28d45d0e87d5fd 100644
--- a/services/native/file_access_service/include/file_access_service.h
+++ b/services/native/file_access_service/include/file_access_service.h
@@ -277,6 +277,7 @@ private:
     std::mutex nodeMutex_;
     std::unordered_map<std::string, std::shared_ptr<ObserverNode>> relationshipMap_;
     HolderManager<std::shared_ptr<ObserverContext>> obsManager_;
+    std::mutex mapMutex_;
     std::unordered_map<std::string, sptr<IFileAccessExtBase>> cMap_;
 };
 } // namespace FileAccessFwk
diff --git a/services/native/file_access_service/src/file_access_service.cpp b/services/native/file_access_service/src/file_access_service.cpp
index 4811f71c996385801d4666e42649db09c8390cb3..d5f8aabd02e66e497320c073e0022b87fd137af5 100644
--- a/services/native/file_access_service/src/file_access_service.cpp
+++ b/services/native/file_access_service/src/file_access_service.cpp
@@ -179,7 +179,7 @@ sptr<IFileAccessExtBase> FileAccessService::ConnectExtension(Uri &uri, const sha
 {
     string bundleName;
     GetBundleNameFromUri(uri, bundleName);
-    lock_guard<mutex> lock(mutex_);
+    lock_guard<mutex> lock(mapMutex_);
     auto iterator = cMap_.find(bundleName);
     if (iterator != cMap_.end()) {
         return iterator->second;
@@ -198,6 +198,7 @@ sptr<IFileAccessExtBase> FileAccessService::ConnectExtension(Uri &uri, const sha
 void FileAccessService::ResetProxy(const wptr<IRemoteObject> &remote)
 {
     if (remote != nullptr && extensionDeathRecipient_ != nullptr) {
+        lock_guard<mutex> lock(mapMutex_);
         for (auto iter = cMap_.begin(); iter != cMap_.end(); ++iter) {
             auto proxyRemote = iter->second->AsObject();
             if (proxyRemote != nullptr && proxyRemote== remote.promote()) {