Cirrus scattering is not only related to the angle of incidence, the angle of scattering, the wavelength, and the polarization state of the light, but also closely related to the roughness of the subsurface of the ice crystal. In this paper, we study different hexagonal plate-shaped ice crystals that are subject to standard gamma distribution with smooth, moderately rough and severe roughness.Scattering characteristics such as extinction coefficient, absorption coefficient and phase matrix of the cirrus cloud are compared to compare the effects of ice crystallites on the scattering characteristics under different surface roughness. The results show that under the same conditions, the rougher the surface of the ice crystals, the smaller the extinction coefficient and the single scattering albedo of the cirrus, the larger the absorption coefficient of the cirrus; the smoother the curve of the six elements of the phase function, the phase matrix The impact is also greater. Therefore, the surface roughness of the ice crystal grains has a great influence on the bulk scattering characteristics of the cirrus clouds. The work done in this paper will further study the influence of the surface roughness of ice crystals on the radiation transmission characteristics of cirrus clouds and the bulk scattering and radiation transmission characteristics of cirrus clouds. It is of great significance for target detection, tactical applications and free-space optical communication.