To study safe net system,on the one hand,much attention is paid to system itself without care of characters of rockfall trace and initial motional parameters.

• 将落石在坡面运动状态归结为跳跃、滚动和滑动,并以危岩起始运动速度作为初始速度,通过分段计算得到落石沿坡面的完整运动路径。