In order to improve the aerated concentration of the stepped energy dissipator, mitigate the damage of cavitation and cavitation erosion, and improve the energy dissipation rate, the stepped energy dissipator with segmented piers was proposed. The influence of the arrangement of the front pier and the reverse pier of the energy dissipator on the hydraulic characteristics of the stepped energy dissipator with segmented piers was studied by numerical simulation. The results show that the stepped energy dissipators with segmented piers generate hydraulic jump near the energy dissipators in the flat and straight section of the terrace. The arrangement of the main pier has better effect of hydraulic jump aeration, higher concentration of aeration along the way, and better effect of cavitation erosion mitigation; The flow velocity along each stage increases gradually, and the arrangement of the main pier has lower flow velocity and better energy dissipation effect; A large range of positive pressure is formed on the upstream area and the upstream area of the energy dissipation pier, and negative pressure is generated on the top and back surface of the energy dissipation pier. The arrangement of the positive pier has a high blocking effect on the water flow, and the arrangement of the reverse pier has a large negative pressure; Under each flow condition, the energy dissipation rate of the two arrangement forms is higher, and the energy dissipation rate of the positive pier arrangement form is higher when the flow is larger, which has better energy dissipation effect. The arrangement of the main pier has better effect in reducing the cavitation damage of the step and improving the energy dissipation rate, which can provide a reference for the structural design of the stepped energy dissipator with segmented piers.