PageRank and Hits, the two main existing rank algorithms for search engine, have already been explored by new improvements in the researches both at home and abroad.

• 现有的搜索引擎排名算法，以基于网页链接结构的算法为主，主要的两种代表性算法是PageRank算法和Hits算法，基于这两种算法国内外许多学者和研究机构又进行了新的探索和改进。