Abstract: The safety control method of the wedge-shaped transition from open-pit to underground mining is to use the surface collapse pit formed by caving the hanging wall to prevent the slope rock movement from threatening the open-pit. However, it is difficult to control the failure process of high and steep slope under ground mining disturbance,which restricts the application of wedge transfer mode in large-scale deep concave open-pit mine. In order to solve the above problems,combined with the limit equilibrium analysis method,the law of progressive failure of high and steep slope under the disturbance of caving mining is revealed,and the calculation method of slope sliding body volume is proposed. Finally,the rock displacement hazard control technology of slope is developed. This technology can control the slope sliding process to make the collapse pit fully accommodate the slope sliding body through regulating the mining sequence. The research shows that the slope will not be continuously damaged with the downward mining of the hanging wall ore. Only when the hanging wall ore is mined to the key section, because the rock mass stress state exceeds the limit equilibrium state,the slope slip failure occurs. The slope slip can be delayed by delaying the stoping of the triangle mine on the hanging wall of the key sublevel,and the volume of the collapse pit can be increased by delaying the stoping of the foot ore body of the key sublevel and using the down-stepped stoping face,so that the collapse pit can receive the sliding body of the slope in an orderly way. The research results improve the applicability of the wedge-shaped transition mode in large deep concave open-pit mines by improving the safety control method.