Based on the related literature,the rough surface simulation method was proposed.The microrough surface contact finite element model was established in ANSYS by software tools.The model was used to analyze the effect of load on elastoplastic deformation and contact area.The results show that with the increase of positive pressure,the elastic contact deformation occurs for more and more microconvex peaks on the rough surface,and the number of contact spots (or contact spot group) is gradually increased,and the elastic deformation of the center of the spots quickly reaches the maximum.When the micro-convex peak is deformed,the surrounding area of the spot is also squeezed.At the initial contact,the micro-convex peak with a large profile height is first elastically deformed.As the pressure increases,the stress of the metal material reaches the yield limit.The concentrated area of elastic deformation and plastic deformation of the rough surface is increasing,and the real contact area is increasing.The increase of the number of contact areas and the increase of the contact area can lead to an increase in the actual contact area on the contact surface.As the pressure increases,the increase in the true contact area is not due to an increase in the number of contact regions,but an increase in the area of the microscopic contact regions