198 1 entered the department of mathematics of Northwestern Polytechnical University, and successively obtained bachelor's and master's degrees from Xigong University, and stayed in the department of mathematics of Xigong University to teach. 1990 was promoted as a lecturer, and 1993 served as an associate professor. /kloc-studied in the information engineering department of Niigata University in Japan in 0/96, 65438+ years.