Oxford University Library pays great attention to environment and energy in architecture. They first noticed the superiority of underground buildings in this respect. On the basis of good library construction in badri, after years of efforts, the building of badri Library, except the old building, was completed on 1946, and most books have been moved to the new library in badri. The new library is connected with the old library through the underground passage, so readers can walk in a 300-yard-long passage between the two libraries without leaving the library, and then they can reach their destination library. Moreover, the foundation of the Sheldon Theatre, which extends 50 yards from the ground floor of the Oxford University Library, is also a secret maze. Some underground passages near Oxford University lead to Hartford College in the southeast, while others lead to the Oxford University Library in the south. In addition, Radcliffe Science Library has also built an underground passage. The construction of underground chimneys and tunnels is of positive significance to the environment, energy and resources.