［Purposes ］ This paper aims to enhance the self -healing performance of asphalt materials and achieve timely and effective healing of cracks in asphalt pavements during service.［Methods］ The thermally induced shape memory polyurethane （SMPU） prepolymer was prepared by the prepolymer method to modify the matrix asphalt，and the SMPU -modified asphalt （SMPU -MA） was prepared.The dynamic shear rheometer （DSR） was used to test SMPU -MA under fatigue，healing，and fatigue cyclic loading in time -scanning mode.The decay rate of dynamic shear modulus H4 （a smaller H4 value indicates better self -healing performance ） before and after the intermittent interval was used as an index to analyze the changing trend of SMPU -MA’s self -healing performance under different conditions.The relationship between shape recovery rate and self-healing performance of SMPU -MA was established.［Findings］ The self -healing performance of SMPU -MA improves with increasing rintermittent interval at the same damage level.At a damage level of 60%，the self -healing index H? of SMPU -MA decreases by 30.92% and 72.11% compared with that of the matrix asphalt after intermittent intervals of 600 s and 3 600 s，respectively.Under the same intermittent interval，a higher damage level leads to a more pronounced improvement in the self -healing performance of SMPU -MA.When the intermittent interval is 3 600 s，and the damage levels are 20%，40%，and 60%，the self -healing index H? of SMPU -MA decreases by 54.38%，56.47%，and 72.11%，respectively，compared with the matrix asphalt.The shape recovery rate of SMPU -MA is linearly and negatively correlated with H4，and the coefficient of determination is as high as 0.953 9.［Conclusions ］ Modifying the matrix asphalt with SMPU to enhance its shape memory characteristics plays a crucial role in improving the self -healing performance of asphalt materials.