Linear and radial styrene butadiene styrene（SBS） modified asphalt with different use levels（by mass） of SBS were characterized using multiple stress creep recovery（MSCR） test at 64 ℃and 70 ℃.Then, non recoverable creep compliance，percent recovery and their stress sensitivities derived from this test were analyzed. According to AASHTO MP 19 10 specification, high temperature performance grading was conducted on modified asphalt with different use levels of SBS. The results show that with the increase of use level of SBS, the non recoverable creep compliance of modified asphalt shows downward trend and percent recovery of modified asphalt shows upward trend, especially for SBS at lower content, which indicates that the increasing use level of SBS is more prominent for the improvement of high temperature performance of modified asphalt at lower SBS content. There is no clear relationship between the stress sensitivity of non recoverable creep compliance or percent recovery of modified asphalt and the use level of SBS. The stress sensitivity of non recoverable creep compliance or percent recovery of modified asphalt becomes basically prominent at elevated test temperature. It is more effective to discriminate the high temperature performance of modified asphalt with different use levels of SBS when 70 ℃ is set as basic grading temperature.