In order to improve the bonding performance between the cermet coating and the substrate,the Ni-WC cermet coating was subjected to the coupling treatment of resistance heating and ultrasonic deep rolling to explore the effect of different ultrasonic deep rolling static pressures on the microstructure of the Ni-WC cermet coating at high temperature environment.The modified cermet coating was tested by scanning electron microscope,X-ray diffractometer and JADE software,and the bonding strength of cermet coatings was investigated by analyzing the surface micromorphology,grain size and surface residual stress of the modified cermet coating.The porosity of modified cermet coatings was evaluated by ImageJ software.Results show that ultrasonic deep rolling at high temperature improves the surface finish of the coating,refines the grains,introduces residual compressive stress,and improves the comprehensive performance of the coating.With the increase of static pressure,the surface micro-morphology of the modified cermet coating is significantly improved,the surface residual compressive stress gradually increases.A partial metallurgical bond is formed between the coating and the substrate,so the bonding strength is greatly improved.The phase transition occurs when the static pressure is high,and the porosity gradually decreases with the increase of static pressure.