Abstract: Abstract：The slope stability is one of the major issues of safe mining operation in open-pit mines.The east open-pit stope of Changshanhao Gold Mine is gradually shifting to deep mining,during which many areas incur land slides of different scale and instability.In light of that,the previous east open-pit boundary is re-delineated and the slope stability of the re-delineated open-pit boundary is analyzed.The paper in detail introduced the comparison and selection of the east open-pit stope boundary,the selection and settings of road parameters,the re-delineation of open-pit boundary and slope stability analysis.The results show that the slope of the optimized open-pit boundary is generally stable and can meet the requirement of safe production.