In view of the high cost of traditional graphene,poor compatibility with matrix pitch and poor dispersion,polyvinylpyrrolidone is used to treat graphene (PVP-G),based on the index of penetration classification system,PG classification system and viscosity classification system.The conventional penetration index performance,rheological characteristics and viscosity characteristics of the PVP modified graphene composite SBS modified asphalt mixture were evaluated,and the appropriate PVP-G blending ratio was optimized.On this basis,three road performances were adopted tests,water immersion APA test,SCB bending tensile fatigue test and indoor MMLS1/3 test,discussed the road performance,fatigue performance and long-term stability of PVP-G/SBS composite modified asphalt mixture.the results shown that,the addition of PVP-G improved the high temperature,low temperature and anti-aging properties of SBS modified asphalt,enhanced the elastic recovery performance and anti-deformation performance of the asphalt binder,and improved the low-temperature fracture resistance and stress release performance.1.5% PVP-G/4.0% SBS composite modified asphalt mixture had excellent high temperature resistance to permanent deformation,fatigue resistance and water damage resistance.Under the combined effects of high temperature long-term load and high temperature water immersion,1.5% PVP-G/4.0% SBS composite modified asphalt mixture exhibited better resistance to permanent deformation and durability than 5% SBS modified asphalt mixture.