PageRank algorithm PR Pr=d +(1-d) PRi the PageRank value of page PR: the PageRank value of page j k: number of the pages j refer to d: a parameter ranging [0, 1 EbusinessPageRank Algorithm PRi ：the PageRank value of page i PRj : the PageRank value of page j kj ：number of the pages j refer to d：a parameter ranging [0,1]. ？ =  + − j j j i d k PR PR d (1 )