效果图：

、

css:

<style type="text/css">
/* 带复选框的下拉框  */
ul li{
	 list-style: none;
	 padding:0px;
	 margin: 0px;
}
	
.select_checkBox{
	border:0px solid red;
	position: relative;
	display:inline-block;
	
	
}	
.chartQuota{
	height:23px;
	float:left;
	display:inline-block;
	border:0px solid black;
	position: relative;
}

.chartOptionsFlowTrend{
    z-index:300;
    background-color:white;
	border:1px solid gray;
	display:none;
	position: absolute;
	left:0px;
	top:23px;
	width:150px;
}
.chartOptionsFlowTrend ul{
	float:left;
	padding: 0px;
	margin: 5px;
}
.chartOptionsFlowTrend li{
	/* float:left; */
	display:block;
	position: relative;
	left:0px;
	margin: 0px;
	clear:both;
}
.chartOptionsFlowTrend li *{
	float:left;
}
a:-webkit-any-link {
color: -webkit-link;
text-decoration: underline;
cursor: auto;
}
.chartQuota p a {
float: left;
height: 21px;
outline: 0 none;
border: 1px solid #ccc;
line-height: 22px;
padding: 0 5px;
overflow: hidden;
background: #eaeaea;
color: #313131;
text-decoration: none;
}	

.chartQuota p {
margin:0px;
folat:left;
overflow: hidden;
height: 23px;
line-height:24px;
display: inline-block;
}	
.chartOptionsFlowTrend p {
height: 23px;
line-height: 23px;
overflow: hidden;
position: relative;
z-index: 2;
background: #fefbf7;
padding-top: 0px;
display: inline-block;
}
.chartOptionsFlowTrend p a {
border: 1px solid #fff;
margin-left: 15px;
color: #2e91da;
}
</style>

	<div class="select_checkBox">
		<div class="chartQuota">
			<p>
				<a href="javascript:;" hidefocus="true" title="请选择指标"><span>选择指标</span>
					<b></b>
				</a>
			</p>
			
		</div><br>
		<div class="chartOptionsFlowTrend"">
				<ul>
					<li class=""><input type="checkbox" value="1"><span>浏览次数（PV）</span>
					</li>
					<li class=""><input type="checkbox" value="1"><span>独立访客（UV）</span>
					</li>
					<li class=""><input type="checkbox" value="1"><span>IP</span>
					</li>
					<li class=""><input type="checkbox" value="1"><span>新独立访客</span>
					</li>
					<li class=""><input type="checkbox" value="1"><span>访问次数</span>
					</li>
				</ul>
				<p>
					<a href="javascript:;" title="确定" hidefocus="true" class="a_0">确定</a><a
						href="javascript:;" title="取消" hidefocus="true" class="a_1">取消</a>
				</p>
			</div>
	</div>

<script type="text/javascript">
	$(function(){
		$(".select_checkBox").hover(function(){
			$(".chartOptionsFlowTrend").css("display","inline-block");
		},function(){
			$(".chartOptionsFlowTrend").css("display","none");
		});
	});
</script>

带复选框的下拉框