In order to explore the modification effect of different modifiers on various performance indexes of matrix asphalt, three different modified asphalts, SBS modified asphalt, TPE modified asphalt and high viscosity and high elasticity modified asphalt were selected for indoor test and comparison. Through the cone penetration test of modified asphalt mortar, PG high temperature classification test, temperature scanning test and MSCR test, the pavement effects of the three modified asphalts are systematically evaluated from the aspects of shear strength, medium and high temperature performance, permanent deformation resistance and deformation recovery. The results show that the preparation of modified asphalt and mortar needs to strictly control the preparation time, shear rate, temperature and other parameters within a reasonable range to ensure that the material meets the requirements. The shear strength of various asphalt mortars has a good correlation with temperature, and the correlation coefficient R² of each regression equation is very high, and the TPE modified asphalt mortar has a high shear strength. The rheological tests of three modified asphalts show that TPE modified asphalt has the best medium-high temperature anti-denatured ability and high temperature creep recovery ability, followed by high viscosity and high elasticity modified asphalt, and SBS modified asphalt is lower than the first two asphalts.