Abstract: The construction project site is close to the north open-pit of a mine,the minimum distance less than 10 m to the open-pit boundary. In addition,a thickness of 1.5~3.0 m weak interlayer is distributed continuously in the site foundation,and exposed on the open-pit slope. The weak interlayer and the open-pit slop constitutes a bedding slope. Because of the special surrounding environment and the structure of foundation,the project maybe suffer geological disasters risks,such as site integral slipping and landslide,and the harmful consequences is very serious. According to the calculation results of the site integral stability and the open-pit slope stability,the weak interlayer safety factor can meet the technical code,and the open-pit slope is in instability and must be reinforced. Considering the site stratigraphic structure and surrounding environmentect,a comprehensive prevention scheme is proposed,including cutting slope and reducing load,pretesting frame anchor,drainage system and engineering monitoring. In accordance with the mechanical properties of rock and soil mass in anchorage section,the anchorage force is determined. The internal forces of the lattice beams are calculated by the models of Winkler foundation elastic beam and continuous beam. After cutting slope and anchoring,the slope stability checking express that the safety factor can satisfy the technical code.