Abstract: Landslide disaster happened in the Shixiakou southern mountain along the throat route from Lanzhou to the Jiuzhou development zone on September 17,2007.The landslide has seriously affected the road safety in the Jiuzhou development zone.Through detailed investigations,the key elements of inducing this landslide are found to be rainfall,unreasonable false virescence irrigation and the high and steep topography in the landslide region.Based on characteristics and formation mechanism of the landsli...