Taking Haidian islands at Haikou as the study area, the paper reasonably generalized the drainage network, road and river water system of drainage system,and developed the hydraulic calculation model of drainage network,and proposed the calculation method of rainstorm waterlogging.The model is verificated by the three measured rainfall records.The simulated waterlogging submerged positions are basically coincided with the actual investigation situation,which shows that the method proposed has good precision and reliability.It respectively simulated the node overflow of drainage network and waterlogging depth of surface with design rainstorm of return period of 1, 2, 5, 10, 20 years by using the method.The model better evaluated the drainage capacity of drainage pipe network at study area;it compared and analyzed the simulated results of measured and design rainstorm and show that the type of rainfall has important influence on simulation result.