The project is located in CAZ in Fengxian, Shanghai, and is designed as a green space in the city center. With the planning goal of "municipal sub-center",this area will become a new cultural landmark integrating office, park, culture, sports and dual-track transportation hub. This design is based on the concept of "1+2+3+5=n", and with "flash" as the design theme, the text connotation and form are integrated, and the pedestrian bridge and the sunken square are combined to realize the mutual connection between the above-ground traffic and the underground business.