Flood risk mapping is an important foundation for the implementation of flood control work from flood control to flood management and provides an important foundation support for flood risk management.It is one of the important non-engineering measures for flood control and disaster relief in China.Flood risk mapping is a complicated process,involving much basic information and the complex factors need to be considered.Flood analysis schemes are one of a vital part of the preparation of flood risk mapping,which is related to practicality of flood risk mapping results.In this paper,we took flood protection area of Ganfu Grand Dyke as an example,setting the rules for flood analysis schemes in the process of flood risk mapping of Ganfu Grand Dyke from these aspects such as flood sources,flood analysis frequency,flood combinations,may breach position,breach wideth and outburst opportunity and weighting the practicality and usability in order to optimize the analysis scheme are stated.It provides a reference for this province and other areas to carry out a comprehensive flood risk mapping.