Abstract: Through the contrast study of deposit body A and B, the paper studied on the spatial engineering effect of large accumulation slope. In the study, we had used the methods of engineering geology analysis , numerical simulation and physics simulation and so on. The paper had dissected the space element which included modality, structure, surrounding and evolvement and so on, put forward the space effect mechanism, inertia-assemble and surplus slide-down power diffuse, put forward the spatial character of accumulation stability and its control approach. According to theoretical studies, writer optimized the timbering design of accumulation slope B, enormously economized project investment of B.