Abstract: The flood risk map is an important component of the flood and drought disaster prevention systems, and its application in displaying the distribution and depth of floods is crucial for improving the flood and drought disaster prevention capability. This article adopts WebGIS and database technology to develop a comprehensive Shanghai flood risk map application management-achievement display application system. The system includes three modules:flood risk map, rainfall isosurface, and monitoring and forecasting. This achievement has played an important technical support and application in Shanghai flood control and disaster reduction work. Through this system, urban management departments can effectively manage the risk of floods and provide guarantees for the safety and stability of the city.