One information you need to know is that the flight field is targeted to be the largest in the world. The airport was made to accommodate the growing need for air transportation in Beijing. In addition, the airport will also be the base of Southern Airlines and China Eastern Airlines.
With a base there, passengers from both airlines who are members of the SkyTeam alliance will be facilitated in terms of flight connections.
According to the Zaha Hadid Architecture website, the airport is designed symmetrically and interconnected. While the colors and materials used are the visual language in traditional Chinese culture.