Abstract: This paper takes the Chaoyang open-pit coal mine as the research background,combines the current situation of mine production and the method of increasing the height and expansion of the dump,and determines the technically feasible dump optimization scheme. Based on the stability of the slopes of the inner and outer dumps of the open-pit coal mine in Chaoyang mining area,a number of dump expansion optimization schemes were proposed. The results show that the expansion of Chaoyang open-pit mine dump is specifically selected to be + 90 m,105 m dump steps and dump continuous rows,with the specific row range being 1 270 m long from north to south and 255～435 m wide from east to west along the direction of the outer dump discharge line. The selection of the inner and outer continuous row expansion scheme not only increases the stability coefficient of the dump slope,but also meets the expansion needs of the dump,meeting the requirements of the slope stability design specification,so as to improve the production capacity.