Green construction is an important part of sustainable development. The Ningbo Airport Road South Extension Project is based on the characteristics of the integrated dual-layer viaduct in the public railway, and the concept of green construction is implemented in the whole process. Adopt a number of green construction technical measures, including the public rail co-channel construction plan that saves land in the planning stage; the research phase of vibration reduction and noise reduction technology, U-shaped rail beam design, and a pair of sectors of bridge integration; “shared bridge machines, set up a dual-layer prefabricated beam ”innovative green construction technology in the construction stage, and the construction of the construction and acceptance standard system of the UHPC new material prefabricated assembly technology. The technical measures adopted have greatly integrated land, optimize the layout of urban space, reduce the impact of the environment during construction, and pay attention to improving environmental noise protection during operation and reducing operational care work.