The project is in three layers with the ground floor area of 39330 square meters, and a basement with the floor area of approximately 64874 square meters. The gymnasium has the entire underground basement, and the ground structure consists of gymnasium, swimming pool and connecting platforms. The upper part is the steel structure roof, and the lower part is the concrete frame structure. The upper steel structure roof adopts the double-sided orthogonal spatial plane truss structure, with the largest roof truss roof span of 67.2 meters * 76 meters, and the maximum structure height of 4 meters. The bottom hinged joints are attached to the top of concrete frame columns. The bearing of roof steel structure uses the finished hinge bearing. The wall truss is the extension of roof plane sheet truss. The part out of the plane applies the spliced truss connection. The bearing is welded to the platform column top or beam. The roof steel structure uses the tubular welded steel truss structure. The primary and secondary trusses adopt the flat steel trusses. The node uses the intersecting welded or cast steel pieces.