Abstract: The dump geometric parameters were optimized to achieve the maximum volume of dump within the limited range under the condition of the safety and stability of the open-pit dump.The security and stability factor of plane and circular sliding were selected to evaluate the safety based on the physical properties of emissions.Relationship between three indexes,slope angle,step height and width,were analyzed,followed by the computation of step height and slope inclination segment by segment.The values close to the optimal solutions were obtained via simulations.The experiment shows that,when the method takes into account the Security and Stability Constraint,the proposed method can pile up more solid waste and occupy less land than other methods.