The article describes the main factors ranking sites by search engines. Using and analysing of these factors by developers of the sites gives to the high positions in results of delivery of search engines. Three groups of factors are specified and examined in the article: internal ranking factors, external ranking factors and behavioral ranking factors. The giving example of search engine ranking pages of Yandex and Google for the developed site consider these factors.
Keywords: the ranking factor, the sorting sites, the search engine optimization, the search engine, site optimization, Internet