利用电场积分方程(EFIE)的矩量法分析了三维电小尺寸目标群的电磁散射问题.目标群表面采用三角形面元进行剖分,面元上的电流分布用子域基函数表示,用伽略金法将电场积分方程转化为矩阵方程求解电流系数,数值计算了目标群的雷达散射截面(RCS)随入射角度的变化,结果显示了目标群的RCS不仅与目标群的种类、目标群的分布有关,还与入射波的方向和极化方向有关. The electromagnetic scattering problem of three-dimensional small target group is analyzed by the method of moment of electric field integral equation (EFIE). The surface of the target group is subdivided by triangular face elements, the current distribution on the element is represented by the subdomain basis function, The slight gold method converts the integral equation of electric field into a matrix equation to solve the current coefficient. The RCS of the target group is calculated numerically with the incident angle. The results show that the RCS of the target group not only depends on the type of the target group, Distribution, but also with the incident wave direction and polarization direction.