Combining flood risk analysis method with GIS technology,the flood simulation model was applied on the flood protection area of Beijiang River levee to describe the flood process and characteristics,and the maximum possible submerge range was drawn out synchronously.The spatial distribution of the submerge depth,flow velocity,period,reach time and other risk indexes were also sketched to express the spatial differences in the flood protection area.A flood risk map was drawn based on the GIS,swing in with social and economic information and fundamental project information.The flood risk map was used in risk information inquiring,flood evaluation,design of emergency and refuge plan to form an integrated system of risk management and decision-making.