这就是解决方案。。

// different author template */
add_filter( \'template_include\', \'author_template\', 99 );

function author_template( $template ) {
    if( !is_main_site() and is_author( ) ) {
        $new_template = locate_template( array( \'other-author.php\' ) );
        if ( \'\' != $new_template ) {
            return $new_template ;
        }
    }
    return $template;
}