The author examines the methods of search engine optimization applicable to library www-sites. The experience of the RAS SB State Public Library for Science and Technology in internal SEO technology implementation to increase the relevance of the resources is discussed. The main focus was made on writing texts for the Library’s www-site (in particular, “The Procedure for presenting information to be loaded to RAS SB SPLS&T’s www-site”). As a result of current search engine optimization, the errors were revealed and eliminated. The author points to the fact that after the optimization process was launched, the steady increase in search engine use has been observed. This evidences that promotion through search engine means cannot bring immediate effect and is rather long-term oriented. In building a new version of the RAS SB SPLS&T www-site, the optimization is scheduled for the design and development stage. It will be based on the accumulated knowledge and experience and is aimed at avoiding inefficient ranging by search engines. The author proves that SEO technologies can be applied to Russian library www-sites to promote library resources and to attract users. The author also concludes that SEO technologies increase www-sites rating and number of their users.