Main study experience: 1988.09- 1992.07 undergraduate students in mathematics department of northeast normal university 1992.09- 1995.07 master students in mathematics department of northeast normal university1995.09-1. 998.07-2000.07 Lecturer of Mathematics Department of Northeast Normal University 2000.07-2004. 12 Associate Professor of Mathematics Department of Northeast Normal University 2006.5438+0. 10-2003.09 Postdoctoral Research of Japan Institute of Mathematical Statistics 2005.0 1- Northeast Normal University Interview with doctoral supervisor of School of Mathematics and Statistics, University of Missouri 2006.11-February 2007