Abstract: The MIKE series software was used to build the one-dimensional and two-dimensional coupling model for Cuijiaqiao flood storage and detention area. The model was verified using measured data during the "2016.7.19" flood event when flood detention area was activated. The design floods of each frequency under the current conditions and planning conditions were simulated, and the flood evolution results of different schemes were obtained. This paper presents the results of the flood risk map and provides experience for the disclosure of flood risk levels and the arrangement of risk avoidance and mitigation.