In order to study the effect of the amount of modifier on the paving performance of styrene-butadiene-styrene block copolymer (SBS) -modified rubber powder (MCR) composite modified asphalt, the effects of SBS and MCR modifiers on the viscoelasticity of SBS-MCR composite modified asphalt were qualitatively and comparatively analyzed, and the change law of paving performance of asphalt cement was quantitatively analyzed by conventional rheological test methods. Through multiple stress creep tests, different modifications were compared and studied. The effect and difference of high temperature rutting resistance of asphalt cement under the dosage of additives. Based on the low temperature bending creep test, the creep stiffness modulus and creep rate of 8 asphalt cements are compared and analyzed. Differences in low temperature flexibility and stress relaxation. The results show that although the SBS-MCR composite modified asphalt with different modifiers has the same high-temperature PG classification, its ability to resist high-temperature deformation may be different; The effect of SBS and MCR modifiers on the stiffness modulus of asphalt cement is similar; 8 kinds of SBS-rubber powder composite modified asphalt cement with low-temperature grade of -24 ℃, good low-temperature road performance; the reasonable recommended final modifier content is 4% SBS + 11% MCR.