It is frequently geological disaster such as debris flows under the action of typhoon rainstorm in Zhejiang, and most of debris flows had been only one times.So it is low frequency. It is result in the difficulty of debris flow for the prevention and treatment. Based on the survey of debris flows, the author explored incidence of layer and landform elements for debris flows according to the fragmentation model.The results indicated that the fractal dimensions values of all influence factors are between 0 to...