Abstract: Xiluodu Hydroproject is an important part of the Yangtze River flood-control system. It is necessary to explore the reasonable flood season staging of Xiluodu Reservoir and its stage regulation for improving the flood control capacity and utilizable benefit, and realizing the safe utilization of flood water resource in the Jinsha River basin. The hydrometeorological factors affecting the flood season staging of Xiluodu Reservoir are collected and determined in this paper, and then a fuzzy set pair analysis method based on entropy weight is established. The flood season of Xiluodu Reservoir is divided into secondary flood season, transitional flood season and main flood season by using the established method. Finally, the results of flood season staging from the established method, the fuzzy set analysis method and the set pair analysis method are compared and analyzed. The comparison shows that the fuzzy set pair analysis method based on entropy weight is simple and practical, and can objectively reflect the impact of the characteristics of the rainstorm and flood in the Jinsha River basin in the flood season. The results of the flood season staging are basically consistent with the conclusions of the fuzzy set analysis method and the set pair analysis method, which proves that the staging is reasonable. The proposed fuzzy set pair analysis method based on entropy weight is reasonable and feasible in flood season staging, which provides the reference for the establishment of dynamic limited flood water level in reservoir flood season.