from lxml.html.soupparser import fromstring
import urllib2
response = urllib2.urlopen('http://www.haojiazhang123.com')
html = response.read()
root = fromstring(html)
desc_list = root.xpath('/html/body/div[1]/div[3]/ul/li[2]/a')
print desc_list
但是,把xpath改成'//div[@class="navi"]/ul/li[2]/a'就匹配到了呢?