Abstract: In this paper,the critical sliding field technology was used to search for and determine the most dangerous landslide location,and then four kinds of slope stability evaluation methods including Ordinary,Bishop,Janbu,Morgenstern-Price were used to analyze the stability of the slope.Application of the above method analyzed the stability of the existing quartz stone open-pit mine slope.In the premise of ensuring the stability of the open-pit mine slope and receiving maximum production of quartz stone,the above methods was used to obtain the optimum slope angle of open-pit mine slope and determine the final mining scheme.