The abandon of stripped rock - soil in open mining and formation of waste dump is related to the mine production safety,personnel life and property security.Dump stability is the core content of open - pit mine safety evaluation,it is also the focus of the mine safety management.Aiming at waste dump slope of Gongchangling open - pit mine,based on geotechnical investigation and analysis on the physical - mechanical properties,and through limit equilibrium method and finite element method,the stability analysis models of waste dump are built,stability calculation of waste dump slope is conducted in normal and rainfall infiltration circumstances,and the stability characteristics of dump slope is analyzed.This paper makes important conclusions and suggestions.It has important guiding and actual significance for the dump engineering in site.