Abstract: Rock fall is a common-place topographical phenomenon and makes a large socio-economical impact.Rock-fall hazard is difficult to assess because it is impossible to predict the exact trajectory of any one block of rock.This paper analyzes and compares some model about rock-fall which have already exsited.Based on a model named cone，we have developed the program to estimate the area of rock-fall，and have taken some precautionary measures according to it.

摘要： 岩石下滑是一种常见的地形学现象，会给人们造成危险和经济上的损失。由于不可能精确预测每块岩石下滑的精确轨迹，因此估测岩石下滑可能造成的危险也是比较困难的。文章对已有的一些岩石滑动模型进行了比较分析，以一种圆锥模型为基础，开发了这个程序用以快速估测岩石可能的滑动范围，辅助相关部门分析，从而在适当的位置采取措施预防灾害。