Abstract: In recent years, with the rapid urbanization, the process of urban water cycle has changed greatly. Extreme rainfall events occur frequently, the total runoff and runoff coefficient increase, and the risk of urban rainstorm and waterlogging increases. As an important tool for urban storm water drainage system planning and design, urban flood model has been more and more widely used. Taking Beijing Daxing International Airport as the research object, this paper constructs an urban flood model, evaluates the drainage capacity of rainwater pipeline and analyzes the flood inundation depth,puts forward the airport rainwater intelligent management strategy, and continuously optimizes and improves the ability of rainwater system scheme to deal with waterlogging risk. At the same time, build a rainwater intelligent management platform, use digital means to realize risk point identification and equipment remote control,formulate waterlogging risk countermeasures and waterlogging prevention emergency measures, comprehensively ensure the safe operation of the airport in flood season, and also provide some reference for the rainwater system management and control of civil aviation airport.