HITS based on the hyperlink structure is a search engine algorithm

but it links without any distinction

so this algorithm can lead to topic-drift. A new HITS algorithm puts forward a similarity metric iterative method is proposed after analyzed the old one. This iterative method incorporates link structure

textual information

and co-citation information into a similarity metric which gives rise to the weight matrix. This weight matrix normalizes the authority value and hub value that produced in every time of the HITS algorithm. The new HITS algorithm is more efficient and better than the old one in regard to the quality and efficiency about search. It also can avoid the problem of topic-drift.