纠结一下午，终于找到原因所在。
*{ margin:0px; padding:0px;font-family:"宋体",Arial, Helvetica, sans-serif; font-size:12px;}
body,h2{background:#d5e9fe url(../images/index4_01.jpg) no-repeat center top;}

改成：
*{ margin:0px; padding:0px;}
body,h2{background:#d5e9fe url(../images/index4_01.jpg) no-repeat center top;font-family:"宋体",Arial, Helvetica, sans-serif; font-size:12px;}