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<title>三行自动等高</title>
<style type="text/css">
*{margin: 0;padding: 0;}
body {margin:30px;font:14px/1.6em Verdana, Lucida, Arial, Helvetica, 宋体,sans-serif;}
.main {overflow: hidden;width: 800px;margin: 0 auto;}
.left {float: left;width: 250px;overflow: hidden;}
.center {float:left;margin-left:5px;width:295px;}
.right {float: right;width: 245px;overflow: hidden;}
.bor_top {height:1px;background:#FB9D51;overflow:hidden;}
.equal {padding-bottom: 32767px;margin-bottom: -32767px;}
.box {background: #F5E2AF;border: 1px #FB9D51 solid;padding-left:10px;padding-right:10px;}
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<div class="main">
<div class="left equal">
<div class="box"><p>阅谁问君诵，水落清香浮</p></div>
<div class="box mt5"><p>阅谁问君诵，水落清香浮</p></div>
<div class="box mt5"><p>阅谁问君诵，水落清香浮</p></div>
<div class="equal mt5 box">
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
</div>
</div>
<div class="center equal">
<div class="box"> <p><p>阅谁问君诵，水落清香浮</p></p> </div>
<div class="box mt5"> <p><p>阅谁问君诵，水落清香浮</p></p> </div>
<div class="box mt5"> <p><p>阅谁问君诵，水落清香浮</p></p> </div>
<div class="equal mt5 box">
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
</div>
</div>
<div class="equal right">
<div class="box">
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
</div>
<div class="box mt5">
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
</div>
<div class="box mt5">
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
</div>
<div class="equal mt5 box">
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
<p>阅谁问君诵，水落清香浮</p>
</div>
</div>
</div>
</body>
</html>
主要样式
overflow: hidden;
padding-bottom: 32767px;
margin-bottom: -32767px;
效果图：
