Introduction to the sub-stand: The sub-stand is the most unique part of the grandstand building. Its membrane-shaped canopy is like lotus leaves, exuding a strong natural atmosphere. It adopts the latest membrane structure form in the world, which fully embodies the perfect harmony of stability, reliability and aesthetics of the membrane structure roof system. The entire area consists of two stands that face each other and can accommodate a total of 20,000 spectators. The auxiliary stands and the track between them form a stage for performances.