中文摘要：

用T矩阵方法计算电磁散射问题时，如果散射体的几何结构满足点群对称性，即在群变换作用下保持不变，可以利用群论找出散射体的几何对称性和T矩阵元的对称性之间的关系，通过预知部分矩阵元的精确值以及它们之间的关系来达到数值求解过程中节约运行时间的目的．

英文摘要：

When solving electromagnetic scattering problem with T-matrix method, if the scattering obstacles have point-group symmetry, i.e. remaining unchanged under the group transformation, we can obtain the relationship between geometric symmetry and symmetry of elements in T matrix by the usage of group theory. In this way we can foresee the exact values of some matrix elements, as well as relations between elements, which would save numerous running time in numerical calculation.