Avada主题的菜单、正文、标题、面包屑路径等等如果想更换为“微软雅黑”中文字体，只需要进入Avada主题的选项，倒数第二项有个Custom CSS，把下面的代码粘贴进去即可。当然你也可以自行改变字体和字号。

解决方案来自Avada主题的官方论坛，后来我自己加进去一些。目前2015-6-20为止比较完整

代码如下：

body {
font: 14px/26px ‘Microsoft Yahei’, Arial, Helvetica, sans-serif !important;
}

#main h1, #main h2, #main h3, #main h4, #main h5, #sidebar h1, #sidebar h2, #sidebar h3, #sidebar h4, #sidebar h5,.fusion-menu a,.fusion-page-title-captions h1,.fusion-columns h3,.reviews q,.fusion-button-text
{
font-family: ‘Microsoft Yahei’ !important;
}

#nav ul li.menu-item a {
font-family: ‘Microsoft Yahei’ !important;
}

.page-title h1 {
font-family: ‘Microsoft Yahei’ !important;
}

.heading h2, .heading h3 {
font-family: ‘Microsoft Yahei’ !important;
}