Professor Yang used to be a professor at Princeton Institute for Advanced Studies, a professor at the State University of New York at Stony Brook and the director of the Institute of Theoretical Physics. 1986, Professor Bowen of the Chinese University of Hong Kong. 1997 as honorary director of advanced research center of Tsinghua university; 1999 retired from Xishi branch, became a professor at Tsinghua University in the same year, and returned to Beijing to settle down at the end of 2003; He was awarded the honorary title of Academician of China Academy of Sciences, National Academy of Sciences of the United States, Royal Society of Britain, Russian Academy of Sciences, Academia Sinica of Taiwan Province, Pontifical Academy and several European and Latin American academies, and received honorary doctorates from many universities. June 5438-1October 065438 was employed by distinguished professor of Hainan University.