He was a visiting scholar at the University of Fribourg, Switzerland, and a senior visiting scholar at Imperial College London, London, England. He used to be an expert in the management of the National 242 Information Security Special Plan, a director of the Chinese Information Society of China, and a deputy director of the Information Retrieval and Content Security Professional Committee. Editors of Journal of Computing Science and Technology, China Computer Magazine, Computer Research and Development, China Information Magazine, etc. , and members of international conference programs such as WWW, ACM CIKM, ACM SIGIR and EMNLP, and reviewers of international journals such as IEEE TPDS, IEEE TKDE and IEEE TC. At present, the main research directions are Internet search and mining, network science and social computing, and network and information security.

As a team leader and academic leader in the field of Internet high-performance software and algorithm theory, network search and network information security in the Institute of Computing Technology, Chinese Academy of Sciences, he led the team to engage in the research and development of national cyberspace security, Internet high-performance software, basic theories and algorithms of network search and mining and related application systems, and successively presided over and completed more than ten major national information security projects, including the National Major Basic Research Program of China Academy of Sciences (973), the National High-tech Research Program (863) and the Knowledge Innovation Project. A series of innovative achievements have been made in the security system of cyberspace information content, high-performance internet software, and basic theory of network search and mining. Editor-in-chief of two academic monographs, at WWW, ACM SIGIR, ACM CIKM, PKDD, Web Intelligence, ANSS, IEEE NCA, PDPTA, Physical Review E, Journal of Statistical Mechanics-Theory and Experiment, At famous international academic conferences such as New Journal of Physics and Expert Syst, academic journals such as APPL, IET Newsletter, JCST and Physics A published more than 100, and obtained more than 10 software copyrights and patents.

He has won many awards and honors, such as "Creative Software" Talent Award, "Mao Yisheng Beijing Youth Science and Technology Award", National Science and Technology Progress Award, China Academy of Sciences Science and Technology Progress Award, China Academy of Sciences Outstanding Young Scholars Award, National Advanced Individual in Science and Technology Research, Outstanding Teacher of Graduate School of China Academy of Sciences, Institute of Computing Technology Award of Chinese Academy of Sciences, and Outstanding Doctoral Thesis of China Academy of Sciences.