Abstract:The size of open-pit slope angle has an important impact on the mine slope safety and mining cost. Reasonable slope angle is an important factor to ensure the safe and economic mining of open-pit. Based on the Muliashi north mining area of Luanshya Copper Mine, the stability of the open pit slope in Muliashi north zone 1 and zone 2 mining area is analyzed by using the Ordinary method, Bishop method, Janbu method and Morgenstern price method of the limit equilibrium method with the geo slope software considering the earthquake influence factors, The results show that when the slope angle of zone 1 is 40 ° and the slope angle of zone 2 is 39 °, the slope is the most stable and can ensure the safe production of the work bench. The research results can provide reference for the stability analysis of the slope of other open-pit at Luanshya.