LI SHUGUANG Li Shuguang, geochemist, was born in Xianyang, Shanxi Province in 1941. He graduated from the University of Science and Technology of China (USTC) in 1965, and then continually worked at USTC as a teacher till now. He was a visiting scientist at the Massachusetts Institute of Technology (MIT), U.S.A.， from 1983 to 1986，and visited Maxplank Institute for Chemistry in Germany and Hong Kong University several times. He has been a full professor of geochemistry at the USTC since 1993, and was elected the academician of the Chinese Academy of Sciences in 2003. Professor Li made several systematic studies in the fields of metamorphic isotope geochronology and chemical geodynamics of continental subduction and achieved some important results as follows: 1The major achievements in the field of isotopic systematics of ultrahigh pressure metamorphic (UHPM) rocks and metamorphic geochronology include: the discovery of excess Ar in phengite from coesitebearing eclogite;  the demonstrating of the Sr and Nd isotopic disequilibrium between the UHPM minerals and retrograde metamorphic minerals; the discovery of isotopic reset for the SmNd system in Archean low grade metamorphic volcanic rocks; and the first report of a precise UPb isotopic age of rutile from eclogite in the world. All these achievements are major contributions to improve the isotopic datins of the UHPM rocks. 2The major achievements in studies of collision between the North China and South China Blocks and evolution of the QinlingDabie orogen include: to report the first group of SmNd ages ranging 244-221 Ma for coesitebearing eclogites from the Dabie orogen and demonstrating of their continental subduction origin, which document that the collision between the North China and South China Blocks was occurred in the Triassic; systematic dating and study of ophiolites and islandarc igneous rocks developed in the Qinling orogen, which provided several key evidences for identification of two suture lines in Qinling belt and the multiblocks continental collision model for tectonic evolution of the Qinling orogen; and the discovery of the Paleozoic islandarc volcanic rocks and eclogite formed by oceanic crust subduction on the north side of the Dabie mountains, as well as the first dating of eclogite from the North Dabie zone, which provided key evidences for identification of the suture line in the Dabie orogen. 3In order to answer the famous scientific question how the UHPM rocks exhumed from the depth of≥100km to the surface, Professor Li first define a tT cooling path with two rapid cooling events, which provided an important evidence for multistage fast uplifting history of the UHPM rocks in the Dabie orogen. Based on this evidence and combined the studies of timing of syncollitional granites in the South Qinling  and Pb isotopic mapping on the Dabie orogen, he proposed a multistage model for exhumation of the UHPM rocks in the Dabie orogen. All achievements mentioned above received much attention from the geological and geochemical societies. The 33 papers published by Professor Li as the first author have been cited 667 times by the SCI journals from Jan. 1, 1994 to Oct. 31, 2004, based on the data provided by American ISI ESSENTIAL SCIENCE IndicatorsSM. The average of citing times for one paper is 20.21. He has supervised 7 postgraduate students. One of them was awarded by the National Nature Science Foundation of China for Distinguished Young Scientist.