The Happy Forest Belt project in Xi'an undertaken by China State Construction Silkroad Construction Investment Group Co., Ltd. is the world's largest underground project for multiple purposes and China's largest urban landscape forest belt project. With a 5.85 km length from north to south and a width of 200 meters, the project covers a total area of about 1,843mu and brings together landscapes, underground spaces, municipal roads, utility tunnels and subway facilities. It sets a model for the integrated development of modern cities that incorporate intensive and efficient production spaces, diversified living spaces, green and sustainable ecological spaces, distinctive historical heritage, and other features. In addition, China State Construction Silkroad Construction Investment Group Co., Ltd. builds an information-based, digital, and intelligent forest belt management, operation and maintenance platform, which reserves interfaces for the access of municipal infrastructure projects and land parcels to be developed. The platform helps build up a network for the construction industry and promotes the coordinated development of the intelligent construction of forest belt projects and building industrialization.