Abstract: Heat transfer, flow field and element distribution in the process of laser cladding Ti6Al4V titanium alloy powders on the surface of Inconel718 superalloy were simulated by using finite element method, and the influence of different laser power on the element distribution of the cladding layer was studied. The results show that the heat conduction plays a dominant role in the the molten pool heat transfer in the initial stage of laser cladding, while the convection plays a dominant role in the middle and late stages. The intensity of liquid flow at the bottom of the molten pool is less than that at the top of the molten pool due to the gradual weakening of the tension gradient on the surface of the liquid and the absorption of fluid momentum in the mushy region at the bottom of the molten pool. The distribution of titanium elements in the cladding layer under 3000 W laser power is relatively uniform compared to 2500 W, and there is less titanium element entering the substrate under 2000 W laser power, which fails to form effective metallurgical bonding. The study results can provide reference for the optimization of process parameters of laser cladding coating.