在电磁理论问题的求解中,往往会遇到大系统问题。如何减少大系统问题的计算时间是一个具有共性的重要课题。本文对求解大系统问题的几种方法进行了介绍和比较性研究,其中包括矩量法,网络分解法,矩阵分块法和空域分解法。文章在简述了这些方法的原理之后,给出了用上述方法以及用普通的矩量法计算同一问题的计算时间和储存量,并且比较了各种方法的特点。 Solving electromagnetic theory problems often encounter large system problems. How to reduce the calculation time of large system problems is an important topic that has commonality. In this paper, several methods for solving large system problems are introduced and compared, including the method of moments, network decomposition, matrix partition and airspace decomposition. After a brief description of the principles of these methods, the article gives the calculation time and storage of the same problem by using the above method and the ordinary method of moment, and compares the characteristics of various methods.