Overhead of these "big umbrella" is composed of 69 pieces of massive white membrane cloth assembled, a total area of 68000 square meters, the service life of 30 years, although is only 1 mm thick, design tension has reached the world's highest strength: 5 tons per meter. Is the film in the high winds set up and down to 3 meters, the wind is blowing, membrane cloth playing like a cloud in the wind.