Porous polyimide (PI) can store lubricating oil in pores,and when porous PI is used as a friction wall,the lubricating oil in the pores will leak out to achieve lubrication.To achieve better lubrication effect,graphene lubricating oil was infiltrated into porous PI to prepare porous PI containing graphene lubricating oil.Using silicon nitride (Si3N4) as a friction pair,the silicon nitride-porous Pi-Si3N4 layer structure and the porous oil-containing PI-lubrication film-Si3N4 layer structure were established based on molecular dynamics principle.The van der Waal energy,shear stress,relative concentration distribution and temperature distribution between porous PI and Si3N4 were simulated.The influence of PI structure containing graphene lubricating oil(PI/CG) formed after infiltration of graphene lubricating oil on the lubricating performance of porous PI was analyzed,and the simulation results were verified by experiments.It was found that after infiltrating graphene lubricating oil into PI pores,the adsorption capacity of PI materials becomes stronger,shear stress decreases,temperature between friction pairs decreases,and wear resistance improves.PI/CG can significantly improve the lubrication effect,and its tribological performance during friction and wear tests is superior to PI/C.