Given the research status and shortcomings of modified asphalt in China,we took China National Offshore Oil Corporation 70# asphalt as the matrix asphalt,SBS and rubber powder as modifiers,and used the dosage of 4%,5% and 6% of SBS as well as 2%,4%,6% of rubber powder to prepare composite modified asphalt for contrast test.We also studied the preparation technology for SBS and rubber power composite modified asphalt,analyzed the trend of ductility,penetration,softening point and elastic recovery with different proportions of composite modified asphalt,and then analyzed the reasons causing the ...