1September 1983 to1July 1986, studied in the Department of Mathematics of Zhengzhou University, and obtained a master's degree from Professor Sun Zhenzu. In the same year, he stayed in the Department of Mathematics of Zhengzhou University as a teaching assistant and lecturer. 1990 the state education commission sent people to study in the mathematics department of sarajevo university in the former yugoslavia. At the beginning of 1993, he obtained a doctorate in mathematics from NOVI Sad University in the former Yugoslavia, and his tutor was Academician mileva Prvanovic. /kloc-returned to China at the beginning of 0/993, and worked in the Department of Mathematics of Zhengzhou University as an associate professor. 1September, 1993 to1July, 1995, I conducted postdoctoral research with researcher Yu in the Institute of Mathematics, China Academy of Sciences. 1995 worked in the department of applied mathematics in Tsinghua University as an associate professor in July, and 1996- 1999 was the director of the teaching and research section of basic mathematics in the department of applied mathematics. 1998 was promoted to professor in August, and1999 was hired as doctoral supervisor in July. 1From September 1999 to July 2000, 1999, I studied under Professor Qiu Chengtong, a master mathematician, and visited the Mathematics Department of Harvard University. From June 2000 to July 2000, he served as Party Secretary of the Ministry of Mathematical Sciences. From July 20065438 to February 2002, supported by Humboldt Science Foundation of Germany, he worked with Professor Udo Simon in the Department of Mathematics of Berlin University of Technology. From February 2003 to February 2007, he served as Party Secretary of the Department of Mathematical Sciences in Tsinghua University. 20 12-20 14 part-time member of Tsinghua University mathematical science center.