Abstract: This paper researches the PageRank algorithm of search engine Google, and introduces its development and the improved algorithm. It aims at that the PageRank algorithm always comes forth the topic drift, so this paper uses the new idea to improve this algorithm. The experiment indicates that the improved algorithm works more efficient than traditional one, reduces the topic drift and improves the satisfactory of the surfers obviously.

Key words: PageRank; Search engine; Ranking algorithm; Google

摘要： 深入剖析了著名搜索引擎Google 的关键技术PageRank 算法，介绍分析了该算法的当前发展现状。并针对PageRank 算法容易出现主题漂移现象，利用提出的二阶相似度改进算法。实验表明，改进的算法有利于减少主题漂移现象，提高用户对检索结果的满意度。

关键词: PageRank；搜索引擎；排序算法；Google