根据粗糙面散射理论，用相位微扰法推导出了从随机粗糙介质表面散射的激光雷达散射截面的理论计算公式。计算了几种粗糙表面样品在１．０６μｍ下的单位面积激光雷达散射截面，数值结果与实验数据基本吻合。 According to the theory of rough surface scattering, the theoretical calculation formula of laser radar cross section scattering from the surface of random rough medium is deduced by phase perturbation method. The RLS cross section of several rough surface samples at 1.06μm was calculated. The numerical results are in good agreement with the experimental data.