diff --git a/api/@ohos.i18n.d.ts b/api/@ohos.i18n.d.ts
index cbb30227566527f1e735cc0c533bcdc01eed78a4..7591d0b84346ab617a529316be4b9bef70a3d0c5 100644
--- a/api/@ohos.i18n.d.ts
+++ b/api/@ohos.i18n.d.ts
@@ -673,6 +673,15 @@ export function getPreferredLanguageList(): Array<string>;
  */
 export function getFirstPreferredLanguage(): string;
 
+/**
+ * Get the preferred language of App.
+ *
+ * @syscap SystemCapability.Global.I18n
+ * @return Returns a string represent the preferred language of App.
+ * @since 9
+ */
+ export function getAppPreferredLanguage(): string;
+
 /**
  * Get the default TimeZone object or the TimeZone object corresponds to zoneID.
  *