Abstract: Under the impacts of extreme climate conditions and urbanization, the issue of urban pluvial flooding is becoming increasingly severe. To effectively address the urban flooding problems in the low hydraulic gradient area of Zhuhai Airport and enhance the operational safety of the airport, this study utilizes the InfoWorks ICM model to analyze the changes in the underlying surface, the drainage capacity of the pipeline, the surface inundation situations, and the flood risk levels under different rainfall patterns. This is done to evaluate the effectiveness of the current renovation projects in flood control and to explore the airport’s adaptability to different rainfall patterns, thereby providing a scientific basis for future flood prevention strategies. The research results indicate that the simulated water depths are approximately 10%different from the observed flood depths, confirming the reliability of the model in analyzing the characteristics of urban flooding in the area.After the renovation of the airport project, the flood risk within the study area has significantly decreased, with a substantial reduction in the areas of different risk levels, and an enhanced response capability to various rainfall types. Particularly, in the case of a 100-year rainfall event, the renovation has significantly improved the performance of the pipeline, increasing the proportion of under-capacity pipe sections length to 58.08% and reducing the proportion of over-capacity sections length from 49% to 16.33%. As a result, the area of urban flooding in the study region was reduced by 88%, and the area with water depth exceeding 50 cm was reduced by 85%. Moreover, when the peak rainfall coincides with the peak tide, the flood risk increases with the delay of the peak rainfall, especially for events with return periods between 5 to 50 years. The renovation has improved the adaptability to central-type and delayed-type rainfall design events, reducing the proportion of pressurized pipe length, demonstrating the effectiveness of the renovation works in enhancing the airport’s resilience to extreme rainfall events. Nonetheless, some local low-lying areas within the study area still face the risk of waterlogging, necessitating continuous monitoring and advancement in the management of flood-prone spots.