提出了电磁散射问题的两种反演方法:确定性梯度搜索方法和MonteCarlo随机搜索方法.给出了两种方法的基本原理,并对反演性能包括对散射体的定位能力、反演精度、反演时间进行了系统的分析与比较.数值计算结果表明,确定性方法定位精确,而随机性方法对散射体电磁参数的反演精度高且速度快,利用两者优点可以增强反演效果. Two inversion methods of electromagnetic scattering are proposed: deterministic gradient search method and Monte Carlo random search method.The basic principles of the two methods are given, and the performance of the inversion method including the positioning ability of the scatterer, the inversion accuracy, The time of inversion is systematically analyzed and compared.The results of numerical calculation show that the deterministic method is accurate in positioning, while the stochastic method has high precision and fast inversion of the electromagnetic parameters of the scatterer, and the advantage of both can enhance the inversion effect.