Go to wp-includes, use dreamweaver to open category-template.php, search the following code: function wp_tag_cloud( $args = ” ) {  $defaults = array(   ‘smallest’ => 8, ‘largest’ => 22, ‘unit’ => ‘pt’, ‘number’ => 45, then change smallest font size and… Read moreHow to control WordPress 3.0 tag cloud font size?