During the process of laser cladding,the cracking of coatings has always been the key hinderance limiting the application of this technology.The tensile plastic strain and residual tensile stress caused by heat input during the cladding process are the main reasons for the cracking.In this paper,the laser cladding process on a 45 steel plate with Ni60 powder feeding was investigated and simulated by finite element method to analyze the temperature field and stress-strain field of the laser cladding process.In the temperature field model,the main considerations were given to the heat source data and the thermal boundary conditions.