diff --git a/api/@internal/component/ets/slider.d.ts b/api/@internal/component/ets/slider.d.ts
index ff35cd0559df0c285e141af2849db409137c262d..e1600e84ce20e18758e5eb30327c05c7b0f160c9 100644
--- a/api/@internal/component/ets/slider.d.ts
+++ b/api/@internal/component/ets/slider.d.ts
@@ -165,6 +165,13 @@ declare class SliderAttribute extends CommonMethod<SliderAttribute> {
    */
   showTips(value: boolean): SliderAttribute;
 
+  /**
+   * Called when the thickness of track is set.
+   * @devices phone, tablet, car
+   * @since 8
+   */
+  thickness(value: Length): SliderAttribute;
+
   /**
    * Called when the selection value changes.
    * @devices phone, tablet, car