The SEO experiment proves the influence of subdomain and subdirectory on the ranking and the analysis of its advantages and disadvantages

When website operation to a certain extent, will face a problem, is the choice of subdomains and subdirectories of the problem, so how to choose? Subdomains and subdirectories exactly which one is more favored by a search engine? Many enterprises website love with two domain feel more cock, more pleasing to the eye. But when we think about it, we have to weigh the score of the search engine. "Baidu search engine optimization guide" has written: choose sub domain name or directory to allocate website content reasonably, which will have a great impact on the website's performance in search engine.
At present, the SEO industry's answer to this question also mostly stays on the theoretical foundation. There is no practice. In order to verify this problem, Xiaobian carried out a systematic SEO experiment. The experiment lasted 2 months, which fully proved the difference between subdomain and subdirectory. Let's share the experiment.
We first select the site object http://www.guajiba.cn an experiment, which is a vertical industry site, we do comparative experiments, the only variable control for a group is a sub domain, another group of subdirectories, with all the other invariants, do two sets of experiments, comparison.
Among them, the variables for the first group at http://www.guajiba.cn/hao, second at http://hao.guajiba.cn, in addition, the two groups share a server, the same IP address, website source code and content are the same, is a vertical navigation site Wangzhuan industry HTML single page, we observed is the keyword "energy-saving", therefore, we set the title of the page description, keywords is the same, the title is "the Navigation Research Institute - Wangzhuan Wangzhuan forum and blog Wangzhuan encyclopedia", closely linked to key words, then the line on the website, so far, we set all the variables and invariants.
After the set up, we are on the two sites are not the chain, we can see clearly that the two experimental group the only difference is that a sub domain, another two level directory below a website, and then to our weekly regular observation data. From the ranking, included, weight and other dimensions to observe and record the experiment data, after two months of the experiment, we found that the data were surprised after finishing, the gap is very big.
However, how to use the specific object of your application. If you want to do a subdomain name, first of all, you should pay attention to whether your website is suitable for doing. If you are a large website, such as 58, Ganji, Tencent, NetEase, Sina, natural selection sub domain, because your body has reached a certain level, the information and resources of these websites are large and extensive. It is absolutely no problem to use a single subdomain name to do a field and industry, and there is no need to stick to a single keyword, but to consider the user's habits.
If you are a small website, this time is not recommended subdomains, I suggest that more suitable for use as a subdirectory, sub domain is equivalent to the new website, the short term can not bring you SEO expression higher, and small and medium-sized websites, the content data are very scarce, not enough to support a sub domain, and the domain name increases the maintenance costs and the workload, if you do not have enough lines to take care of, your weight will cause the occurrence of the phenomenon of partial cross.
So it's much better to build a subdirectory than a two - level domain name for small and medium - sized websites. The web site's directory will inherit more weight from the home page, so there will be a better ranking performance. Subdirectories can be increased by the weight provided by the main domain name, and the traffic is more.