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 526a54f9364392682db8a7be87907c446f3b1a7d..ea54c61a4712b81658941471e3662c97d7811d1e 100644
--- a/services/native/file_access_service/src/file_access_service.cpp
+++ b/services/native/file_access_service/src/file_access_service.cpp
@@ -245,6 +245,7 @@ void FileAccessService::CleanRelativeObserver(const sptr<IFileAccessObserver> &o
     uint32_t code = obsManager_.getId([obsContext](const shared_ptr<ObserverContext>  &afterContext) {
         return obsContext->EqualTo(afterContext);
     });
+    lock_guard<mutex> lock(nodeMutex_);
     for (auto pair : relationshipMap_) {
         auto codeList = pair.second->obsCodeList_;
         auto haveCodeIter = find_if(codeList.begin(), codeList.end(),