Abstract: In view of the complex geological conditions, Janbu slice method of limit equilibrium was used to analyze the pit slope stability of metal mine during the transition from open-pit mining to underground mining.The factors to which the stability coefficient F_s is sensitive were studied.The sensitivity study indicates that the three main influencing factors are soil cohesive force C, internal friction angle   and volume weight γ of sliding body.The change law of F_s with them under different conditions was analyzed and it was concluded that the internal friction angle is the most sensitive one of the three.The analysis of sensitivity influencing factors has provided a theoretical basis for controlling the sliding belt and controlling the pit slope slide.

Key words: Cohesive force C, Internal friction angle φ, Unit weight γ Influencing factors, Sensitivity change law, Safety coefficient