1999 Stay at Peking University. He is currently a professor in the Department of Mathematics in Peking University and concurrently the director of the Analysis Teaching and Research Section. Up to now, more than 0 SCI mathematical papers 10 have been published. Six of them have been published in world-class authoritative magazines, such as Acta Math. Duke j math, Amir j math. Communication mathematics. He Lv. Progress in mathematics. , geometry and function. Analysis, etc. He has been invited to give special reports at major international academic conferences for many times. He has also been invited to visit internationally renowned universities and mathematical research centers for many times, such as French Advanced Mathematical Research Center, Massachusetts Institute of Technology, Berkeley Mathematical Science Research Center, University of Tokyo and tokyo institute of technology. Worked as a researcher in the Mathematics Research Center of Australian National University for two years (April 2002-April 2004).