Educational Background -06/1999 06/2001(Ph.D.), Dept. of Appl. Math., University of Twente(特文特大学), Enschede, The Kingdom of Netherlands, Ph. D. Thesis: Circuits in Graphs and the Hamiltonian index, PDF. -09/1990 07/1993(M.Sc.), Dept. of Appl. Math., University of Science and Technology Beijing(北京科技大学), Beijing, M.Sc. Thesis: The Vertex Arboricity of a Graph. -09/1983 07/1987(B.Sc.), Dept. of Appl. Math., Jiangxi Normal University(江西师范大学), Nanchang, Jiangxi. Working Experience -06/2002 present, organization of Mathematics and Statistics, Beijing Institute of Technology(北京理工大学), Beijing 100081. -09/1993 05/2002, Department of Mathematics, Jiangxi Normal University(江西师范大学), Nanchang, Jiangxi. -07/1987 08/1990, Department of Mathematics, Yichun University(宜春学院), Yichun, Jiangxi.