Abstract: Under the background of rapid urbanization, urban flooding is becoming more and more serious. Urban flood control has become an important bottleneck restricting the sustainable development of economy and society. This study project focuses the attention on the key technology of urban flood monitoring, early warning and emergency response of the national key research and development plan "monitoring, warning and prevention of major natural disasters", and carries out the research on urban flood disaster assessment and risk management. The project is carried out in three aspects: urban flood disaster assessment method, urban flood risk analysis, and urban flood risk management and countermeasures. The expected results are of great scientific significance and practical value to the sustainable economic and social development in China.