The gate is a section gate built on a plain river channel, mainly used for irrigation, flood control and drainage. The discharge water is discharged downstream through the gate, so the gate design must meet the above requirements. First, the dimensions of the gate hole, gate, gate floor and other infrastructure are designed. The gate width is 8.0m and the height is 6.7m. The total clear width of the gate chamber is 45.6m. Stabilize the above buildings to meet the requirements of relevant regulations. If it is not satisfied, then modify it, check until it is satisfied. The main facilities of the project include gate, gate floor, energy dissipation facilities, gate pier, working bridge, traffic bridge and retaining wall. Reinforcement calculation is performed on the bottom plate of the gate, and a single-hole one-link is selected as the research object, and the elastic foundation beam method is used for design calculation to obtain the required reinforcement area. Finally, design the retaining wall.