The development of a visual simulation system for planet terrain laser ranging is very important to the processing of planet terrain information. The digital planet terrain is simulated by using a fractal method and the satellite orbit data and the survey point distribution are calculated. The regular DEM is obtained for the surveyed terrain information and the 3D scene of satellite orbit and survey point distribution in the survey are demonstrated dynamically. The difference between the original terrain and the surveyed terrain is displayed through a terrain render algorithm based on LOD.