【Objective】To improve the workability of high-viscosity and high-elasticity modified asphalt, 【Methodologies】the warm mix agents Sasobit and WSG-H03 were added to the high-viscosity and high-elasticity modified asphalt prepared by the composite of waste rubber powder and SBS, and the warm mix high viscosity and high elasticity modified asphalt was prepared. The viscosity reduction effect of the warm mix agent and its effect on the rheological properties and microstructure of high-viscosity and high-elasticity modified asphalt were evaluated by macroscopic performance test and microscopic test.【Results】Results showed that modified asphalt with 3% SBS and 20% waste rubber powder viscoelasticity was 4130 mPa·s, and the elastic recovery rate was 90%. The viscosity of high-viscosity and high-elasticity modified asphalt was reduced by about 22% and 33% when the dosage of warm mix agent Sasobit and WSG-H03 were 3% and 0.5%, respectively. The results of fluorescence microanalysis were processed by the threshold method, and it was found that both warm mixes reduced the mean particle size and variance of SBS in high-viscosity and high-elasticity modified asphalt.【Conclusion】3% SBS, 20% waste rubber powder preparation of modified asphalt to meet the high-viscosity and high-elasticity modified asphalt viscoelasticity requirements. Warm mix agent has a negative effect on the high and low temperature performance of high-viscosity and high-elasticity modified asphalt; The viscosity reduction effect of 0.5% dosage of WSG-H03 warm mix was better than that of 3% dosage of Sasobit warm mix; the incorporation of warm mix improved the dispersion of SBS in high-viscosity and high-elasticity modified asphalt.