According to laser statistical scattering properties of ice crystal particles with rarefied random distribution, differential scattering section(DSS) of ice spheres with exponential distribution, lognormal distribution, Gamma distribution changed with scattering angles were calculated numerically and analyzed at 0.65, 1.31 and 1.55 μm, respectively. The results show the change of incident laser wavelength has a certain effect on DSS of ice-crystal layer. And DSS of ice spheres with exponential distribution is the largest, which is several orders of magnitude larger than the other two distributions. So different laser wavelength and size distribution models of ice particles have great influence on laser scattering properties of rarefied random distributed ice crystal particles. The works in this paper are based on the foundation for further study development of the effect of ice-crystals cloud on the laser propagation properties in the ground-air links.