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This paper presents numerical studies on spray painting processes by using three different atomizers,i.e.a high-speed rotary bell atomizer,an airless gun and a pneumatic air spray gun.A commercial CFD code was applied using Euler-Lagrangian approach for two phase flow calculations.Special attention was paid to the droplet impingement process on the substrate.Orthogonal impact velocities and size distributions of the droplets depositing on substrates were analyzed in detail and compared with the previous results,such as film thickness distributions on substrates and spray jet velocity fields.Simulation results show differences of the impacting droplets characteristics of these three atomizers,which will have significant influences on the properties of the forming paint films.