Abstract: We used CT scanning and PFC^3D to establish the gravel-bearing slip soil model in three dimensions. Firstly, we obtained the point cloud data of the gravels through binarization processing and boundary identifying technology based on a series of two-dimensional CT images. Then, according to the boundary point cloud data, we established the three-dimensional model of every gravel by inverse reconstruction method. Finally, we imported the reconstructive model into PFC^3D. The simulated results show that Euler angles of the gravels changed with the development of shearing deformation of the triaxial sample. Compared with the sample without gravels, the movement of balls around the gravels is more non-orientable, which indicates that the existence of the gravel has remarkable influence on the development of shearing zones. We verified the feasibility of this method through analyzing the moving regulation of the gravels in triaxial test. In brief, the study on the movement of gravels has great meaning to reveal the development of shear failure in gravel-bearing slip soil using CT and PFC.