diff --git a/zh-cn/application-dev/reference/apis/js-apis-uitest.md b/zh-cn/application-dev/reference/apis/js-apis-uitest.md
index efe59299e6e362d09626f74dfb325f9e7283ab22..a56c3869003a3e33c3a5c60024a5091acc2e9f6d 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-uitest.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-uitest.md
@@ -1285,7 +1285,7 @@ async function demo() {
 
 ### triggerCombineKeys<sup>9+</sup>
 
-triggerCombineKeys(key0: number, key1: number, key2: number): Promise\<void>
+triggerCombineKeys(key0: number, key1: number, key2?: number): Promise\<void>
 
 UiDriver对象通过给定的key值，找到对应组合键并点击。例如，Key值为(2072, 2019)时，UiDriver对象找到组合键并点击ctrl+c。