Accurate division of flood stages during the flood season helps alleviate the contradiction between flood control and beneficial use of reservoirs, enabling the utilization of flood resources. The seasonal staging methods for floods are constrained by regional hydrological differences, and each method has its unique advantages and applicable limitations. Taking the Ansai Hydrological Station in the Yanhe River Basin of Shaanxi Province as an example, this study uses mathematical statistics, circular distribution method, and fractal theory to conduct staging calculations and compare the results of flood staging during the flood season in the basin, determining a reasonable scheme for flood staging during the flood season in the loess hilly region. The results show that, considering the variation patterns of rainstorm and flood in the Yanhe River Basin, meteorological conditions, underlying surface, and other factors, the pre-flood season above the Ansai Station of the Yanhe River is from June 1st to July 15th, the main flood season is from July 16th to August 31st, and the post-flood season is from September 1st to October 31st. In comparison, the results of flood staging division using the mathematical statistics method are relatively rough in accuracy; the results of the circular distribution method can better represent the seasonal characteristics of floods during the flood season and can serve as the basis for flood staging; the results of flood staging based on fractal theory are more reasonable and reliable in the study area and can be used as a scientific basis for flood staging and reservoir operation decision-making.