<style>
.wrap{width:1200px;height:800px;border:1px solid #ccc;margin:50px auto;}
.box{width:1200px;height:800px;display:table-cell;vertical-align: middle;text-align: center;}
img{vertical-align: middle;}
</style>
------------------------------------------------------------------------------------------------------
<body>
<div class="wrap">
<div class="box">
<img src="1.jpg" >
</div>
</div>
</body>
原文：http://www.cnblogs.com/jackyblog/p/6251819.html