Abstract: In the waterway regulation and river regulation projects, in order to promote the deposition along the beach and protect the beach, basde on the characteristics of guide plate structure and permeable structure, a new perforated deposit-promoting plate for beach protection is proposed in this study. In order to further analyze the siltation promoting and sediment retaining effect of the plate, its flow characteristics are deeply studied. Based on the RNG k- ε turbulence model, a three-dimensional numerical model of perforated deposit-promoting plate is established, and the numerical model is verified by the physical model test data of the plate under the action of water flow. The effects of different flow velocities, percentages of opening area and relative single hole areas on the flow velocity and deceleration rate around the perforated deposit-promoting plate are calculated and analyzed, and the empirical formulas for prediction of the optimal percentage of opening area and the optimal single hole area are fitted. The results show that the relative single hole area has little effect on the flow pattern in front of the plate, but has an effect on the velocity flow pattern behind the plate and the formation of deceleration zone. The larger the percentage of the opening area, the worse the deceleration effect behind the plate. When the percentage of the opening area is 30%, the deceleration effect near the bottom is the strongest. The inflow velocity will affect the deceleration effect of the perforated deposit-promoting plate, and the deceleration effect is the best when the inflow velocity is 0.2 m/s.