On April 21, visitors began to be allowed to visit South Square of Beijing National Aquatics Center again. Previously, Beijing National Aquatics Center implemented renovation project for Cooling Tower System of South Square from March 10 to April 20, which lasted for 40 days. This lays a foundation for the future construction of underground ice center in South Square. During the Winter Olympics 2022, underground ice rink of South Square can be used by athletes for training warm-up. After the Winter Olympics 2022, it will be retained as an Olympic legacy and push forward the sustainable development of curling sports in China.