In recent years, as the rapid development of society and local economy, the urbanization level increases, many city carrying capacity approaching the limit, so the new city district construction become the new growing point of city. In the new city district construction process, the level of road construction mileage most can reference to related standards, but to determine the level of road network structure often lack of scientific and effective way. This paper, based on the transport turnover, supply and demand balance as the basic principle, utilize the balance between the infrastructure of the new urban district in future and transportation demand to establish model to work out a new city road network level structure, not pursue supply capacity absolute terms maximization, but with the actual matching, establish the optimal way level structure.