Research conclusions：It is proved that monitoring is not only the important composite part of collapse and landslide survey, research and treatment, but also an effective way of obtaining the information on prediction and forecast of collapse and landslide disasters. Through the monitoring, the deformation characters and regularity can be known clearly, and the boundary conditions， scale，slide direction , collapsing mode , happening time and danger can be predicted and forecasted. In this way, the measures can be taken for preventing, reducing and avoiding the disasters as much as possible.