The design flood of Yantoupi reservoir is comprised of the flood of the regulation calculation on discharge process of Sheshang reservoir and interval flood process. The method of rainstorm and flow is used to calculate the interval flood,discharge of Sheshang reservoir for design flood calculation. the flood calculation is carried out by using the principle of no consideration of thedownstream flood control object and taking into account the downstream flood control object.The discharge of Sheshang reservoir is the inflow discharge of Sheshang reservoir regulation by calculating results under the principle of no consideration of the downstream flood control object and taking into account the downstream flood control object.