Abstract:With the development of city and the improvement of traffic system, the construction of expressway viaduct is becoming more and more mature. The elevated high-speed three-dimensional transportation network greatly improves the transportation capacity of city. At the same time, the landscape space under a viaduct, as a special form of urban landscape, has also attracted the people's attention. Its treatment mode can directly reflect the landscape style of a city. The landscape space under a viaduct is discussed through theoretical research and case practice, which provides certain reference for the design of landscape space under expressway viaduct.