diff --git a/frameworks/native/backup_ext/include/ani_utils.h b/frameworks/native/backup_ext/include/ani_utils.h
index 03cbc44f11928785559b10f2a2e7421b737023bb..39296415599be3b41fe71216aae04894e5137558 100644
--- a/frameworks/native/backup_ext/include/ani_utils.h
+++ b/frameworks/native/backup_ext/include/ani_utils.h
@@ -40,7 +40,8 @@ public:
         }
 
         ani_class cls;
-        if (ANI_OK != env->Namespace_FindClass(ns, clsName, &cls)) {
+        const std::string fullClsName = std::string(nsName) + "." + clsName;
+        if (ANI_OK != env->FindClass(fullClsName.c_str(), &cls)) {
             std::cerr << "[ANI] Not found class " << clsName << std::endl;
             return nullobj;
         }
diff --git a/interfaces/kits/ani/file_uri/src/ani_file_uri.cpp b/interfaces/kits/ani/file_uri/src/ani_file_uri.cpp
index 8ba4067de8098b260f7970723987439a13936ac4..70972d6b614c2e16dc6dc11ba3804141b13bf8c2 100644
--- a/interfaces/kits/ani/file_uri/src/ani_file_uri.cpp
+++ b/interfaces/kits/ani/file_uri/src/ani_file_uri.cpp
@@ -130,17 +130,10 @@ void FileUriConstructor(ani_env *env, ani_object obj, ani_string stringObj)
     StdSharedPtrHolder<ModuleFileUri::FileUriEntity> *holder
         = new StdSharedPtrHolder<ModuleFileUri::FileUriEntity>(std::move(fileuriEntity));
 
-    ani_namespace ns;
-    if (env->FindNamespace("L@ohos/file/fileuri/fileUri;", &ns) != ANI_OK) {
-        LOGE("Namespace L@ohos/file/fileuri/fileUri not found.");
-        ThrowBusinessError(env, EPERM, "Namespace L@ohos/file/fileuri/fileUri not found.");
-        return;
-    };
-
     ani_class cls;
-    static const char *className = "LFileUri;";
-    if (env->Namespace_FindClass(ns, className, &cls) != ANI_OK) {
-        LOGE("Not found class LFileUri in Namespace L@ohos/file/fileuri/fileUri.");
+    static const char *className = "@ohos.file.fileuri.fileUri.FileUri";
+    if (env->FindClass(className, &cls) != ANI_OK) {
+        LOGE("Not found class LFileUri in Namespace @ohos.file.fileuri.fileUri.");
         ThrowBusinessError(env, EPERM, "Class LFileUri not found.");
         return;
     }
@@ -182,10 +175,10 @@ ANI_EXPORT ani_status ANI_Constructor(ani_vm *vm, uint32_t *result)
         return ANI_ERROR;
     };
 
-    static const char *className = "LFileUri;";
+    static const char *className = "@ohos.file.fileuri.fileUri.FileUri;";
     ani_class fileUriClass;
-    if (ANI_OK != env->Namespace_FindClass(ns, className, &fileUriClass)) {
-        LOGE("Not found class %{public}s in %{public}s.", nsName, nsName);
+    if (ANI_OK != env->FindClass(className, &fileUriClass)) {
+        LOGE("Not found class %{public}s.", className);
         return ANI_NOT_FOUND;
     }
     std::array classMethods = {