The project is located in Wenzhou City, Zhejiang Province, with an above ground three story building area of 39330 square meters and an underground one story building area of approximately 64874 square meters. The underground of the comprehensive sports hall is a complete basement, and the above ground structure consists of the sports hall, swimming pool, and their connecting platforms. The upper part is a steel structure roof, and the lower concrete structure is a concrete frame structure. The upper steel structure roof adopts a two-way orthogonal flat truss structure. The maximum roof span of the roof truss is 67.2m * 76m, and the maximum structural height is 4m. The lower chord is hinged to the top of the concrete frame column. The support on the roof steel structure adopts finished hinge support, and the wall truss is an extension of the roof flat plate truss. The outer plane is connected by plate truss, and the support is welded to the top of the platform column or beam; The structural roof adopts a steel truss structure with intersecting welded circular steel pipes. The main and secondary trusses are flat steel trusses, and the nodes are made of intersecting welded or cast steel parts.