The so-called modified asphalt (mixture) refers to an asphalt binder made of rubber, resin, high molecular polymer, natural asphalt, ground rubber powder, or other external admixture (modifier), thereby improving the asphalt or the performance of the asphalt mixture. A modifier refers to a natural or artificial organic or inorganic material added to asphalt (mixture). At the same time, with the development of the times, a single modifier has a certain effect on improving the durability of the asphalt mixture, but its ability to resist aging, plastic deformation, fatigue, and other durability is relatively weak, so the modification effect of a single modifier on asphalt cannot meet the requirements of existing pavement performance. Therefore, composite-modified asphalt has emerged. Composite-modified asphalt mainly refers to multiple modification of matrix asphalt.