Abstract: Taking the temporary substation chamber as the research object, the distribution laws of displacement field and plastic zone is revealed in this paper, with the situation of the complicated hydro geological, large buried depth and high stress in Jiulong Coal Mine of Fengfeng Group are considered and the numerical simulation software FLAC^3D is adopted to analyze the engineering geological conditions of surrounding rock of chamber, therefore, the combination supporting scheme is proposed. The field measurement convergence law of the displacement of surrounding rock indicates that the supporting scheme can effectively control the large deformation, bottom heave and flowing deformation of the deep chamber under high stress.