A numerical simulation model of active illumination beacon considering surface roughness is established. Based on this model, the effect of roughness on intensity uniformity and wavefront mean square root of scattered light is discussed, and the difference between wavefronts detected by an active illumination beacon and a point source beacon and the correction effect of an adaptive optical system are analyzed. Moreover, as the surface roughness of a target is decreasing, the wavefront mean square root of scattered light and the difference between wavefronts detected by the active illumination beacon and point source beacon are increasing, but the correction effect of the adaptive optical system is decreasing. In addition, increasing the number of illuminator will suppress the influence of uplink turbulence on wavefront sensing.