Abstract: The present paper develops an SPH-FEM coupling computational model for simulating water droplet impact on wind turbine blades. Further,the dynamic process and material impact response of water droplets impact on the coating surface at high velocity are calculated. The results show that there are two contact force peaks after the impact of the water droplets. The first peak is caused by the high pressure formed when the water droplet is compressed,which will form high stresses on the coating surface,but the effective plastic strain is not significant. The second peak is the lateral diffusion caused by the release of high pressure inside the water droplet,which will cause a large plastic deformation on the coating surface and become the main factor of blade leading edge damage. The increase in water droplet velocity or decrease in the coating material thickness leads to a larger contact force,with a larger area of plastic deformation and plastic strain on the coating surface.