重点：不要浮动
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>不确定内容宽度</title> </head> <style> .box{ width:1000px; background:red; text-align:center;} .content .pic{ display:inline-block;} .content{ margin:0 auto; width:auto;} </style> <body> <div class="box"> <div class="content"> <div class="pic"><img src="http://www.baidu.com/img/bdlogo.gif"/></div> <span>文本很长很长文本长很长</span> </div> </div> </body> </html>