Based on the basic theory of electromagnetic scattering and radiation transmission, the scattering phase functions of various kinds of atmospheric aerosol with special distributions in typical UV band are presented. A direct sample method has been used to simulate the discrete polydisperse Mie phase functions of haze aerosol. Comparisons are made between the Henyey-Greenstein phase function, the modified Henyey-Greenstein phase function, the direct sample phase function presented in this paper and the polydisperse Mie phase function. The influence of different scattering phase function simulation methods on radiative transfer properties has been studied by using the Monte Carlo method. Numerical results showed that the rigorous simulation of scattering phase function is of importance in radiative transfer problems.