In order to investigate the temperature field distribution of LENS CBN abrasives,three-dimensional modeling numerical simulation was carried out by using Simufac.Welding based on the Gaussian surface heat source and the cylindrical heat source.The influence factors such as convection,heat conduction,latent heat of phase change and thermal properties were considered in the model and the distribution of temperature field under different process parameters was also analyzed.In addition,the actual temperature measurement was carried out to verify the reliability of temperature field simulation.At last,the characteristics of rapid heating and cooling in LENS are analyzed according to the microhardness value of the profile.