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A numerical study, used for particle size distributions of several classical aerosol types, is conducted in this paper. By improving the log-normal distribution model in previous paper, we employ the stochastic particle swarm optimization (SPSO) algorithm associated with a multi-lognormal distribution model. The nonambiguity and robustness of SPSO with this model is validated. We recover particle size distributions of two classical aerosol types using the measured AOT data (at wavelengths λ=0.400, 0.690, 0.870, 1.020μm) obtained from AERONET at different time. The results show that the model of this paper presents characteristics of aerosol particle size distributions at different regions and time. And this model shows good practicability to distinguish aerosol types and calculate particle size distributions.