原文地址：http://zmingcx.com/wordpress-editor-increase-chinese-fonts.html

在function.php中添加如下代码：

function custum_fontfamily($initArray){
$initArray['font_formats'] = "微软雅黑='微软雅黑';宋体='宋体';黑体='黑体';仿宋='仿宋';楷体='楷体';隶书='隶书';幼圆='幼圆';";
return $initArray;
}
add_filter('tiny_mce_before_init', 'custum_fontfamily');

function enable_more_buttons($buttons) {
$buttons[] = 'styleselect';
$buttons[] = 'fontselect';
return $buttons;
}
add_filter("mce_buttons", "enable_more_buttons");