Some results on return signals of a spaceborne lidar when used in sounding of the top level clouds and two-level cloudiness at λ = 532 nm have been calculated by Monte Carlo method. The estimates have been obtained for geometrical conditions corresponding to the parameters of BALKAN and LITE lidars. Some peculiarities in the signal formation and in the formation of the multiple scattering background are studied depending on the optical and geometrical conditions considered in the numerical experiments conducted.