Abstract: Under the open slope,the roadway layout and Stability of rock is well exposed in the mining technical issues must be resolved in the open-underground mining well. Based on the typical open-underground Anjialing 2nd coal mine in Pingshuo mining area, the stability of three mining area Roadway surrounding rock of the N0.4 mine seam under the North slope of Anjialing open pit is researched by the field observations, numerical simulation, and other means. According the research, we found that the Primary Stress Direction of roadway deformation damage is horizontal stress. Roadway deformation and failure parallel to the direction of the main roadway deformation and damage; the roadway damage in the first sequence, after the progressive process of destruction; surrounding rock damage of roadway is characterized mainly slope damage. Therefore, the stop line is the key to stability of surrounding rock.Key woWT