200 1 papers on heteroclinic bifurcation and * * vibration slot of second-order vibration system with parameters and forced excitation, linearized vibration of nonlinear first-order differential equations, some properties of adjoint matrix, etc. The main research directions are: ordinary differential equations and differential dynamic systems, matrix theory. 1996 was named as an associate professor. From September, 2000 to June, 2002, I visited the Department of Mathematics of Nanjing University, mainly studying solitary wave solutions of nonlinear evolution equations. He has taught mathematical basic courses such as mathematical analysis, advanced algebra and advanced mathematics for non-mathematics majors, and the teaching effect is good.