Abstract: A few methods for calculating electromagnetic field are introduced-analytical method, finite difference method, finite element method. A static electromagnetic problem is taken as an example. Numerical solution are achieved by MATLAB finite difference program which programed by the author and ANSYS plat- form. By comparing numerical solution and anlytical solution, the conclusion that the numerical solution is satisfied for engineering are achieved. How to reduce the computer memory and redundant data are discussed as well.

Key words: electromagnetic field, numerical analysis, analytical method, finite difference method, MAT- LAB