[1]   2001.8 to  Now
Peking University
Professor, School of physics, Peking University 
[2]   1996.1  to  1998.2
Australian National University
Visiting scholar, Department of nuclear physics, School of physics, Australian National University 
[3]   1994.8  to  2001.4
Peking University
Associate Professor, Department of Technical Physics, Peking University 
[4]   1992.8  to  1994.7
Peking University
Lecturer, Department of Technical Physics, Peking University