随着电磁理论的发展和计算机性能的不断提高，计算电磁学在最近几年得到了长足的发展。其中，时域有限差分法(FDTD)由于其独特的性能和优点得到了越来越广泛的应用和重视。本文利用有限差分法求解非对称屏蔽线最低两个TE模的色散特性曲线，横截面场分布.-With the increasing development of computer performance and electromagnetic theory, computational electromagnetics in recent years has been considerable development. Among them, the finite difference time domain (FDTD) method because of its unique properties and advantages has been more widely used and valued. In this paper, the finite difference method for solving the dispersion characteristic curve asymmetric shield the two lowest TE modes, the cross-sectional distribution.