A three-dimensional discontinuous deformation analysis(3D DDA)method was used tooutput the kinetic energy and motion trajectory of rolling blocks. Compared with the results of the ex?isting laboratory experiment and numerical simulation method,the accuracy of the 3D DDA methodwas verified. By analyzing the influence of the rockfall platform on the kinetic energy,motion trajecto?ry and movement law of blocks along rock slopes with different slope heights,slope angles and foldingpoint positions,the influence law of the rockfall platform on the block movement was studied. Final?ly,the rockfall slope with a complex slope shape at Lang village in Tibet was simulated,and the pro?tective effect of the rockfall platform on rockfall disaster was analyzed. The results show that the rock?fall platform can decrease the kinetic energy of the rolling block,change the block motion trajectory,and reduce the impact of the rolling block on the protection structure or the traffic line at the slope bot?tom. Meanwhile,the general laws including the block movement and the corresponding platform de?sign width under different slope characteristics are given,and they provide a basis for the design ofrockfall platform.