这段代码适合我：

<div class="form-group">
    <div class="row">
        <div class="col-md-6 pull-left">
            <label class="control-label">Total Tax</label>
        </div>
        <div class="col-md-6">
            <input type="text" class="form-control" id="tottax" />
        </div>
    </div>
</div>

http://jsfiddle.net/d2kt0kp2/