E-mail:{lihhjs}@ruc.edu.cn; Hai-Hua Li was awarded B.S. degree in computer software and theory from Beijing University of Technology in 2000. Currently, she is a Ph.D. candidate of Renmin University of China. Her main research interests include semantic Web, intelligent information retrieval and knowledge engineering. E-mail:{duyong}@ruc.edu.cn;Corresponding Author Xiao-Yong Du is a professor and Ph.D. supervisor of School of Information, Renmin University of China. His main research interests include intelligent information retrieval, knowledge engineering and high performance database. He is a member of CCF. tianxuan@bjfu.edu.cn Xuan Tian was awarded Ph.D. degree in computer application technology from Renmin University of China in 2007. Now, she is a teacher of Beijing Forestry University. Her main research interests include personalization retrieval, intelligent information retrieval and knowledge engineering.