diff --git a/api/@internal/component/ets/styled_string.d.ts b/api/@internal/component/ets/styled_string.d.ts
index 13e178bb06e971fbd113671b3427c01b1e3230dd..45b24924e6438a393e4488cffbdc635ad2c0f80c 100644
--- a/api/@internal/component/ets/styled_string.d.ts
+++ b/api/@internal/component/ets/styled_string.d.ts
@@ -1779,6 +1779,18 @@ declare class ImageAttachment {
      */
     readonly size?: SizeOptions;
 
+    /**
+     * Get the imageSize of the StyledString.
+     *
+     * @type { ?SizeOptions } - the imageSize of the StyledString in vp unit or undefined
+     * @readonly
+     * @syscap SystemCapability.ArkUI.ArkUI.Full
+     * @crossplatform
+     * @atomicservice
+     * @since 21
+     */
+    readonly sizeInVp?: SizeOptions;
+
     /**
      * Get the ImageSpanAlignment of the StyledString.
      *