Abstract: During the blasting excavation of mountain slope,due to improper blasting method,the shape of the slope is irregular and the slope is not reasonable.A large amount of rock mass remains on the slope.After the slope unloading,the deformation of the slope shoulder is large and the sustained collapse and destruction is occurred.It is a directly threat to the safety of construction activities of adjacent building on the slope bottom.According to the characteristics of this kind of slope and the geological structure,the causes and characteristics of the collapse accumulation body landslide was analyzed,and the non-limitation of workspace control method of collapse accumulation body landslide was put forward.It was proved by engineering practice that using the composite structure of back berm+slope protection pile+pillar-plate wall+bolt lattice girder to protect similar slope is safe and economical,and is convenient for construction.Support structure and slope bottom construction process can be parallel conducted,safety requirements and period of slope bottom construction is guaranteed,which provides a reference for similar slope management.