Urban interchange is an important traffic transfer node in the city. Whether the drainage system works well or not has an important impact on the overall performance of urban traffic.This paper analyzes the main characteristics and unfavorable factors of the design of the drainage of the submergence interchange, probes into the drainage mode of the interchange and the main points of the design optimization, and puts forward some concrete measures and suggestions for the optimum design of the rainwater pumping station and the regulating storage tank. In order to deal with the harm of excessive rainfall to submergence interchange, a new design, vision, is put forward.%城市立交作为城市重要的交通转换节点, 立交排水系统能否正常运转, 对城市交通的整体性能发挥具有重要影响.论文分析了下沉式立交排水设计的主要特点和不利因素, 对立交排水方式、设计优化要点等进行了全面探讨, 对雨水泵站、调蓄池优化设计提出了具体措施和建议.为有效应对超标降雨对下沉式立交带来的危害, 提出了排放与调蓄并举的新设计理念.
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