In order to improve the quality control technology capability of asphalt pavement engineering, CT scanning is used to obtain the shape of coarse aggregate, generate a group of solid coarse aggregate particle models, and then use discrete element software to generate asphalt mixture simulation specimens with coarse aggregate shape and gradation composition characteristics. Digital simulation experiments are explored to achieve digital control of asphalt mixture quality.Marshall simulation specimens were generated by combining four different contact behaviors: coarse aggregate body, mortar mortar, aggregate mortar, and aggregate aggregate with the skeleton structure; The accuracy of the model specimen was verified by indirect tensile splitting test, and applied and analyzed in combination with typical quality control conditions. Taking the low-temperature performance of asphalt mixture as an example, the application analysis of simulation specimens for comparing the replacement performance of equal volume and equal mass with optimized mix proportion is carried out.The research results indicate that Marshall specimens constructed using three-dimensional discrete element method can effectively simulate indirect tensile mechanical behavior and distinguish typical conditions in the quality control process; From the perspective of splitting strength and fracture energy, it is found that the equal volume replacement method is closer to the splitting test performance of the original grade than the equal mass replacement method; The morphology of coarse aggregates with a larger particle size range is more closely related to the structure of the mixture. The solid coarse aggregate three-dimensional discrete element Marshall simulation specimen can be applied to the quality control of asphalt mixture, which has remarkable effect and can make the project management and control work more convenient and faster.