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介绍了目前正在迅速发展和应用范围非常广泛的一种电磁理论的数值计算方法——时域有限差分法（ＦＤＴＤＭ）的基本理论：Ｙｅｅ的算法（它是将问题的解域离散化成直角立方体网格，并将直角坐标系中的Ｍａｘｗｅｌ旋度方程用有限差分方程来代替，然后在相应的边界和初始条件下解有限差分方程的一种新型的数值计算方法）以及在Ｙｅｅ算法基础上的很多扩展的理论方法。给出了它们在电磁理论方面的广泛应用。最后提出了ＦＤＴＤ方法对计算机资源的要求和改善计算技术问题。
This paper introduces a kind of numerical calculation method of electromagnetic theory (FDTDM), which is rapidly developing and widely used. The basic theory of FDTDM is Yee’s algorithm (which is to discretize the domain of the problem into a rectangular cube network Lattice, and the Maxwell curl equation in Cartesian coordinate system is replaced by a finite difference equation, and then a new numerical method for solving finite difference equations under the corresponding boundary and initial conditions) and on the basis of the Yee algorithm Expanded theoretical method. They are given a wide range of applications in electromagnetic theory. Finally, the FDTD method for computer resources requirements and improve the computing technology.