Abstract: This paper clarifies the basic concepts, connotations and elements of flood, flood disaster and flood risk based on the flood risk management theory. In addition, the concept of flood resilience is discussed, and the narrow sense and the broad sense of flood resilience are put forward. In terms of flood risk analysis technique, it integrates flood inundation analysis, flood impact and damage assessment. The flood risk analysis software is completely independently developed and coupled with rainfall runoff generation, one-dimensional and two-dimensional hydraulic model, underground drainage and low impact development (LID) measure module, realizing the whole process synchronous simulation of ground inundation, underground drainage, road flood discharge and underground space water inflow. Furthermore, it supports the minute-level rapid flood damage assessment of multiple types of assets based on multiple inundation data sources. The technique is suitable for flood risk analysis in flood protection areas, flood storage and detention areas, cities and other types of areas and has been widely used in flood risk mapping, flood risk assessment, flood impact assessment, flood control plan preparation, land spatial planning and so on. It has provided strong technical support for flood control and disaster reduction and flood risk management and achieved remarkable economic and social benefits.