Flood risk map is a generic term of a series of diagrams identifying distribution characteristics of risk information as causes,grades,features,objects endangered and emergency countermeasures etc.,and has become one of the important non-engineering measures on flood control and disaster mitigation for cities at home and abroad.In view of the diversified needs of flood risk map in China,drawing up of the map is studied from different service purpose.A multi-layer mapping method is proposed,and the flood risk map is divided into three layers in-cluding the actual flooded mapping,flood risk forecasting mapping and flood risk assessment information.The in-formation that are used for making flood hazard mapping,involving past inundation information,flood hazard fore-casting information and flood risk assessment information,are discussed according to the design principle of multi-layer flood mapping.Urban flood simulation model is used to make information for the flood hazard mapping,and calculation conditions of the model,including initial conditions,boundary conditions and run control mode,could be properly selected according to the purpose of flood hazard mapping.%洪水风险图是标识区域洪涝成因、量级、特性、危及对象及应急对策等风险信息分布特征的一系列图的总称，当前已成为国内外城市防洪减灾工作中重要的非工程类措施之一。针对我国对洪水风险图的多元化需求，从不同服务目的出发对洪水风险图编制工作进行研究。提出了洪水风险图分层编制技术，将洪水风险图划分为实际洪水淹没图、洪水风险预测图和水灾风险评价信息等3个层次，并根据分层设计原则对编制不同类型洪水风险图所需的既往洪水信息、洪水风险预测信息、水灾风险评价信息做了详细论述。提出将洪涝仿真模拟技术应用于城市洪水风险图编制工作之中，针对洪水风险图的应用目的合理选定计算模型的初始条件、边界条件与运行控制方式等，经模拟计算获取编制洪水风险图所需的洪水风险信息。
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