Abstract: Current urban underground spaces face many problems such as extensive development and low landuse efficiency. An intensive underground comprehensive space is built to address these problems and promote highquality development of infrastructure. Accordingly, the integrated design practice and key techniques for underground comprehensive spaces for the energy finance and trade zone in the new Xixian area within Xi′an, China, are explained in detail. A threedimensional space integrating municipal, traffic, culture, commercial, and leisure functions is developed. The space includes: (1) a multilevel integrated utility tunnel with trunkbranchcable along the urban road network; (2) an urban ring tunnel connecting municipal roads and plots; and (3) a doublelayer fourzone green corridor around the metro station in the energy finance center using a transitoriented development mode. Furthermore, the project connects every part of the underground space to form a whole, and the utility tunnel and urban ring tunnel are constructed separately at special inflection points. Finally, the ventilation methods and evacuation plans are proposed without any targeted design and construction standard guidance. The intelligent unified management platform is used for joint control.

Key words: intensive underground comprehensive space, integrated design, utility tunnel, underground traffic link tunnel, public transportation