Abstract: The combined model of open-pit with underground mine are generally adopted to exploit shallow coal seam or mineral deposit,precious studies are mainly focused on the stability of the slope under open-pit mining, and the research on the problems due to underground mining is attached less importance to. This paper analyses the failure process of the slope under different underground mining sequence from the angle of analysis of the slope failure feature due to combining mining, and the mining order is optimized, filed practice proves that the mining sequence put forward in this paper is reasonable.