Iranian rock asphalt （IRA） modified asphalts （IRAMA） with IRA content of 5%-20% as modifier were successfully prepared. The microstructure characteristics of IRA and IRAMA were analyzed. The road performance of IRAMA was tested. The rheological properties of IRAMA were analyzed. The results indicate that the polar groups on the surface of IRA make it of strong adsorption capacity and stable chemical properties. The reaction between IRA and base asphalt belongs to physical blending. With the increasing of IRA content， the better the elastic response of IRAMA under cyclic load， the stronger the permanent deformation resistance under high temperature. The addition of IRA improves the high temperature performance of asphalt.