The average scattering phase function is proposed, to present the angular scattering properties of cloud droplets more accurately than Henyey-Greenstein (H-G) phase function. The theoretically multiple scattering model is founded in the form of Markov chains, which is based on probabilistic theory and stochastically migrating theory. The characteristics of path loss under given communication configurations are obtained by Monte Carlo simulation algorithm. The best communication configurations for non-light-of-sight (NLOS) atmospheric aerosols scattering and cloud-droplets scattering are analyzed, considering whether there are clouds suspending in the atmosphere. The rationality of analysis is validated by the consistency between experimental data and simulation results. The conclusions referred in this paper are wavelength-dependent, and laser diode (LD) with wavelength 808 nm is chosen as the source light of experiment and simulation.