The high-viscosity asphalt has the characteristics of high viscosity,low penetration and high softening point.Its mixture is superior in high temperature stability and water stability,but slightly worse in the low temperature cracking resistance.In this article,the natural rubber asphalt which is named Superflex in Indonesia would be used as modifier to make the high-viscosity asphalt.Then four kinds of zero dimensional nanometer CaCO3 were chosen to carry out the compound modification and test the penetration and other basic indicators of different compound modified asphalt,and the better performances of the C type nanometer CaCO3compound modified asphalt would have been achieved in PG grade test.From the result of the test,the conclusion that the high viscosity asphalt which is added to nanometer CaCO3 will improve its conventional performance indicators is put forward,and the PG level will reach SBS level,and the low temperature performance is better than SBS.