According to the characteristics of coaxial powder laser cladding,the dynamic process of temperature field was simulated by using the finite element software ANSYS,and three-dimensional model of cladding morphology was obtained by life-death method.The influence factors such as the attenuation of laser energy,the temperature rise of powder particles,latent heat of phase change and temperature on thermal physical properties were analyzed in the model,and the results of the temperature field were analyzed and verified.The results show that the temperature gradient in front of the molten pool is larger than that of the back molten pool,and the maximum temperature of the molten pool will remain stable after a short time.Ni-based WC composite powders were deposited on the high manganese steel surface using 4000 W multimode fiber laser.The microstructure of Ni60A coating is mainly refined dendrite.Through the observation and analysis of the cross-section morphology,microstructure and temperature distribution of the cladding layer,the accuracy of the simulation results is verified.It provides a theoretical reference for the preparation process of coating.