This project has won Zhejiang Gold Award for Steel Structure. The main part of Ji’an Culture and Art Center is an approximately 1200-seats Grand Theatre, boasting functions like Community Art Center, Calligraphy Creation Art Gallery and Cultural Leisure Service Industry Area. The roof is similar to rectangular shape, 172m long from the north to the south and 134m wide from the east to the west. The roof adopts spatial lattice girder structure, which is connected to the concrete structure inside and 163 swinging columns outside the concrete. The lattice girder structure is cantilevered with outrigger in four sides with a cantilever length of 1-10m. The lattice girder thickness is 2.5-2.8m and its maximum cantilever length of the four corners is 10m.