Abstract: After underground mining from open-pit,Open-pit and underground mining interact with mutual disturbance,more complex factors,the risk of the Landslide increases.Knowing the mechanism of mining steep deposit in transferred underground mining from open-pit has a great significance for the development of mining resources in the deep.This article is based on yunye mine underground mining from open-pit in Beijing by the numerical simulation analysis method studying the effects of mining underground area in different regions with different spatial positions slope stability.And it reveals the induced by each other and mutual interference mechanism between the open pit mining and underground mining and the characteristics of exploited influencing scopes superimposed and included.On this basis,further analysis of the deformation and mechanism of rock slope caused by underground mining is made.The results prove that:when mining depth of 240m,the Composite Slope slope angle reaches the maximum,and the state of the slope is at risk;deformation of different divisions of dangerous mining is more consistent with the actual situation.