This paper elaborates how the information retrieval models based on either term index or link analysis resolve the problem of ranking the documents,it also discusses the advantages and drawbacks of these models.
［１］ G.Salton and M.E.McGill. Introduction to Modern Information Retrieval. McGrawHill Book Co., New York ,1983
［２］ S.E.Robertson and K.Sparck Jones. Relevance weighting of search term. Journal of the American Society for Information Sciences,27(3):129 ,1976
［３］ S.Brin and L.Page. The anatomy of a large-scale hypertextual Web search engine. In Proceedings of the Seventh International World Wide Web conference 1998,pages 107-117
［４］ J.Kleinberg. Authoritative sources in a hyperlinked environment. In Proceedings of 9th ACM-SIAM symposium on Discrete Algorithms. 1998