The project is located in Yanqing District, Beijing. The building function is the performance center. The building area of the concrete part is about 1300 ㎡, and the projected area of the steel structure roof part is about 6700 ㎡. The steel structure roof part is supported by 26 cantilevered steel trusses arranged in an umbrella shape. The roof has a butterfly shape. The maximum cantilevered length is about 47m, the maximum weight is about 42.6t, and the maximum plane size is 119 × 114m, and the roof height is about 18.5M.