Abstract:In-depth understanding of the application of set pair analysis in the flood season of reservoirs, select 5 indicators including the total number of heavy rain days in the middle of the ten days, the average rainfall in the ten years, the maximum three-day rainfall in the middle of the ten days, the average water inflow in the ten years, and the number of maximum flood peaks in the middle of the ten-day year. CRITIC based on the weighting and fuzzy set pair analysis method, a subtraction set pair method for staging flood season based on CRITIC weight is constructed. Taking Foziling Reservoir as an example, the flood season of Foziling Reservoir is divided into four periods: pre-flood season, main flood season, summer drought period, and post-flood season. Finally, a comparative analysis is made with the subtraction set pair potential method. The analysis results show that: based on the CRITIC weight subtraction method, the flood season staging method considers the relative influence of different hydrometeorological factors on the flood season staging, and the flood season staging results are reasonable, which provides a reference for reservoir scheduling and management.