Abstract: A new quantitative calculation method of the earth-rock output of debris flow is presented in this paper.In the area of geological disaster development,the earth-rock output assessment is involved in both the surface loose accumulation and the output of the possible geological hazards,such as collapse and landslide.In the collection area of debris flow,the terrain is divided into 0-time valley and 1-time valley.Two methods are used to analyze the results of the calculation in order to make it mo...