diff --git a/api/@ohos.statfs.d.ts b/api/@ohos.statfs.d.ts
index d1798e8e6a5e1b6c5a1a29202e2b11814779102a..db90b1e755b40272b6a4e4f2b72e189d3821eb28 100644
--- a/api/@ohos.statfs.d.ts
+++ b/api/@ohos.statfs.d.ts
@@ -36,6 +36,13 @@ declare namespace Statfs {
    */
   function getTotalBytes(path: string, callback: AsyncCallback<number>): void;
   function getTotalBytes(path: string): Promise<number>;
+  /**
+   * Get the number of available bytes of the specified path.
+   * @param path The path is a sandbox path: /data/storage/el2/base/haps/entry/files
+   * @since 9
+   */
+   function getAvailableBytes(path: string, callback: AsyncCallback<number>): void;
+   function getAvailableBytes(path: string): Promise<number>;
 }
 
 export default Statfs;