In order to study the stacking behavior of coarse aggregate during the compaction process of gap-grade asphalt mixture, the 3D printing technology was used to prepare the “tracking aggregate” based on the real aggregate shape, the combination of Superpave gyratory compactor (SGC) and X-ray CT non-destructive scanning technology was also adopted to scan the different states of the SMA-13 mixture with “tracking aggregate” during the compaction process. The scanning results were processed by IPP (Image-pro premier) and MATLAB to quantitatively study the stacking behavior of aggregate during compaction process. The results show that the implantation of 3D printed aggregates in asphalt mixture will not have obvious influence on its original grading and mechanical properties, and it is suitable as a kind of "tracking aggregate" for the study of aggregate stacking behavior in asphalt mixture. In the process of rotary compaction, the coarse aggregate particles are rolled and stacked under the action of external force. The coarse aggregates in the middle and upper layers tend to move vertically downward, while the particles in the middle and lower layers tend to horizontally stack and space rotate. For the gap-graded asphalt mixture SMA-13, the asphalt content has significant influences on the displacement Dxoy in the horizontal plane. The compaction temperature and asphalt content both have significant influence on the rotation angle Φ (o) of the aggregate space, andStheSinfluenceSof asphalt contentSwasSmore.S