可能的原因如下：您可能还没向百度提交您的网站； 您已经登录了网站，但由于时间短，百度还未收录； 如果百度检测到您的网站无法访问，您的站点就有可能被百度暂时删除； 如果您的网站内容有不符合中国法律的地方，则无法被百度收录； 如果您的站点页面结构复杂，则可能无法被百度收录（详见如何使您的站点被百度有效收录）；

You may not to Baidu to submit your site;
You have logged sites, but a short time, Baidu has not included;
If Baidu detected that your website can not access your site is likely to be Baidu temporarily removed;
If your site content is not consistent with Chinese law places can not be Baidu included;
If your site page structure complex, it may not be Baidu included (see how to make your site by Baidu effective included);

如果您的网站被百度判别为垃圾站点，则可能被百度拒绝收录或者随时删除（详见百度关于垃圾网站的处理）。

如果您的网站的首页在百度搜索不到，则可能是由于您的网站不稳定使首页被判别为死链接导致丢失。您的网站稳定后，首页会重新在百度中被搜索到。

If your site has been identified as spam sites Baidu, Baidu may be included or at any time refuse to remove (see Baidu on waste treatment site).
If your site's home page in the Baidu search less, it may be because your site instability Home sentenced to death another link to cause loss. After your site is stable, Home will be back in Baidu in the search.

百度并不允诺能收录所有站点。如果有上述回答无法说明的问题，请发信到webmaster@baidu.com询问。