将T矩阵方法与几何光学方法相结合，精确计算了从太阳短波到红外谱段具有一定形状分布和谱分布的非球形沙尘粒子的光学特性，并与等体积球形沙尘的光学特性进行了比较。结果表明：1)相比沙尘粒径大小分布对沙尘气溶胶消光效率因子，单次散射反照率以及不对称因子的影响，沙尘形状对上述参数的影响明显偏小；2)非球形与球形沙尘粒子的相函数在短波区存在显著差异，这种差异在卫星探测常用的可见光区达到最大，并且随着散射角的变化具有一定的规律；3)在短波区，雷达方程中的消光后向散射比受沙尘形状的影响比较显著，因此在利用雷达方程反演沙尘气溶胶光学厚度时应考虑非球形效应。

The optical properties of nonspherical dust aerosols in the wavelength range of 0.2~40 μm are calculated by combination of T-matrix method and an improved geometric optics under the conditions of representative shape distribution and size distribution. By comparing the optical properties of dust particles between nonspherical and isochoric sphere hypothesis. It is found that 1) the shape of dust aerosols has a smaller influence on the extinction efficiencical factor, scattering albedo and asymmetry factor compared to the size distribution; 2) the difference of phase function between nonspherical and spherical dust aerosols in the short-wave region is significant, especially in the visible region, and they change with different scattering angles; 3) in short-wave region, the extinction-to-backscattering ratio in the so-called lidar equation is affected by the shape of dust aerosols greatly, therefore, the nonspherical effects should be considered in the retrieval of dust optical thickness by using the lidar equation.