Abstract:: This paper analyzed and summarized successes and existing problems based on the survey on the space utilization under the urban overpasses and viaducts in Xi"an. In this way, the target of enhancing traffic efficiency, service functions, ecological environment, and urban quality can be achieved in accordance with the principle of putting people first, adjusting measures to local conditions, and setting up one plan to one bridge. More precisely, space utilization under the bridge was first studied on classification according to urban demands and construction conditions. On this basis, design strategies and schemes were proposed for various typical space utilization under the bridge in conformity with the design concept of “compliance, safety, efficiency, suitability, and landscape”. It can provide technical reference for reasonably utilizing spaces under the bridge.