Abstract：Based on indoor physical model test, the whole process of the collapse, slip and accumulation of coarse-grained soil along the slope is studied. The influences of some factors on the final accumulation state parameters(mainly including the stroke, the maximum stack thickness and its position)of the soil mass in slumping process are investigated in this paper,these factors include the initial state , particle size and slope angle of coarse-aggregate soil mass. Based on the discrete element numerical analysis method, the particle flow software is used to compile the simulation program of the collapsing movement of coarse-aggregate soil mass. Furthermore, the research on the collapse process of coarse-aggregate soil mass is carried out. The numerical simulation is basically consistent with the indoor test results. The results show that the final state of the deposit is almost unaffected by the initial state; the inclination of the chute has great influence on the horizontal position of the maximum accumulation thickness when the accumulation body is stable. According to the numerical calculation results, the relation between the inclined chute angle and the horizontal position of the maximum accumulation thickness is calculated. The inclination angle of the chute has great influence on the final accumulation form; as the inclination angle and the particle size increase, the stroke and the range of the maximum accumulation thickness increase,while the maximum accumulation thickness decreases.