Abstract: In view of the increasingly prominent problem of flood disaster in Zhongshan City under the joint influence of global warming and rapid urbanization, based on the measured precipitation data of Zhongshan City from 1970 to 2020 and on May 4,2024, this paper systematically analyzes the causes of the most serious "20240504" rainstorm flood disaster in recent years from the aspects of heaven, earth, pipe and river, and puts forward countermeasures. The research shows that the intensity and frequency of extreme rainstorm after urbanization are on the rise, and have the typical characteristics of large intensity, long duration and wide range; The engineering defense system has shortcomings such as blocked river flood discharge, low drainage pipe network design standards, shrinking rainwater storage space, and lagging emergency dispatch response; In order to cope with the urban resilience construction under the super standard rainfall, it is suggested to improve the flood discharge capacity of the river channel, the drainage capacity of the urban pipe network, the flood regulation and storage capacity of the river basin,and improve the hydrological monitoring, flood forecasting and water project scheduling, so as to provide reference for improving the urban rainstorm and flood disaster prevention level.