In view of the problems that the maximum main dam height of a pumped storage power station is 182.3m, the soil and stone material source of the upper reservoir is scarce, the geological conditions of the dam foundation are complex, the bank slope fluctuation is large, and the reliability requirements of the dam deformation and anti-seepage structure are high, a zoning optimization scheme of the main dam section was studied to improve the safety performance. The stones excavated by the stone factory in the upper reservoir is fully considered to build the dam. The slope ratio of the upstream and downstream rockfill boundary is set to be 1∶0.4. Modulus-increased zone is set below the dam crest. In order to ensure the structural safety, the connecting plate is translated into the reservoir with a reduction of the turning section curvature, and the foundation cushion is optimized into special cushion with special transition material.