Abstract: The influence of impact hight of tailings debris flow on the people evacuation and building site selection is analyzed in detail form the perspective of disaster prevention and mitigation.Regarding the high and capactity of tailings dam,downstream valley slope and bending coefficient as influence factors,some relative research work on the infulence law and extent of different influence factors is done by adopting the orthogonal experiment method.In addition,the experimental data is regression analyzed so as to obtain the forecast mathematical model of the height of debris flow impact. 　　

Key words: Tailings, Debris flow, Impact height