Abstract:The Weiling Street (Yannan Second Road) Expressway in Xi'an is an important cross in planning the “nine-horizontal and nine-vertical” expressway network and is an important channel for the southern urban cluster. The completion of the project will fully activate the channel function, reconstruct the regional skeleton road network, share the traffic load of the South Ring II and South Ring III (ring expressway), improve the regional traffic carrying capacity and improve the transportation environment. The construction is of great significance. By analyzing the functional positioning of the project, and sorting out the construction conditions and main control factors, the road traffic functions are clarified, and the overall design scheme of the project is introduced in detail, which provides the useful reference for similar expressway projects.