To investigate the evolution of temperature field and the distribution law of residual stress of laser cladding coating,laser cladding inconel 718(IN718) alloy on 316L stainless steel substrate was carried out to study the effect of process parameters on the morphology of the cladding coating.Based on the process parameters obtained from the experiments,the thermal mechanical coupling model was established by using the finite element software Simufact Welding,and the distribution of temperature field and stress field in the cladding process was analyzed.Results show that the laser power has a significant positive correlation with the coating width,and the powder feeding amount has a significant positive correlation with the coating height,while the laser scanning speed has a significant negative correlation with the coating height.The temperature gradient at the front of the molten pool is the largest,and the temperature gradient at the rear of the molten pool is small.The peak temperature of molten pool stabilizes at about 2 700 ℃ with the progress of cladding scanning.The maximum residual stress of the coating is the tensile stress along the scanning direction,the residual stress of the substrate is symmetrically distributed on both sides of the coating,and the maximum residual stress is the tensile stress along the scanning direction.The residual tensile stress is the main reason for the “warping” deformation of the substrate in the process of laser cladding.The difference of thermal expansion coefficient between substrate and coating is another reason that affects the bonding strength between coating and substrate.This research lays a foundation for the follow-up research based on multi-layer and multi-channel laser cladding in industrial application.