Abstract: As the basis of knowledge organization resources, thesaurus should be updated and maintained constantly. This paper considers the mechanisms of folksonomy and Wikipedia, combines expert knowledge with user experience, explores the new mechanism for user interaction thesaurus updating and maintenance. The interactive method, which is composes by recommendations based on standardized thesauri and userdefined theme is put forward and verified by the experiment. It is expected to reveal the real needs of users accurately, and promotes the sustainable optimization of thesaurus.

Key words: knowledge organization, user interactive, thesaurus, tag, folksonomy