目的研究三面角反射器后向散射场问题，并对射线跟踪法的典型算法进行改进，以提高运算速度．方法利用射线跟踪法对电大尺寸的三面角反射器的后向散射场进行分析，并利用斯托克斯定理将射线跟踪法中的面积分简化为代数多项式．结果对提出的算法进行了实例计算，计算结果与以往的试验结果基本吻合．结论将射线跟踪法应用于三面角反射器的后向散射场的研究中；改进后的算法不但计算准确而且运算速度也有所提高 Aim To study the problem of backscattering field of the triangular reflector and to improve the typical algorithm of the ray tracing method to improve the computing speed. Methods The backscattering field of the large size triangular reflector was analyzed by ray tracing method, and the area fraction in the ray tracing method was reduced to algebraic polynomial by Stokes’ theorem. Results The proposed algorithm is calculated by the example. The calculation results are in good agreement with the previous experimental results. Conclusion The ray tracing method is applied to the study of the backscattering field of the trihedral reflector. The improved algorithm is not only accurate but also increases the computing speed