To address the issues of adverse flow conditions and significant siltation in the confined waters of the Longhuazui bend in the Huangpu River,a study is conducted on the bend’s evolution analysis and regulation plan layout.By using technical methods such as data comparison,three-dimensional mathematical models,and ship simulation techniques,a waterway regulation plan is proposed,involving dredging and cutting the shoal of the Longhuazui Bend while filling and stabilizing the deep channel along the concave bank.The model calculation results show that the regulation plan is highly effective.After implementation,the main improvements in navigation conditions for the bend are as follows:1)The turning angle of the water flow within 500 m of the accident-prone bend is reduced by 5.8°.2)The maximum cross-flow during ebb tide is reduced by 30%.3)The siltation on the convex bank is reduced by about 35%.The results of the ship maneuvering simulation model show that after the implementation of the plan,the intensity and frequency of the ship’s steering personnel controlling the ship’s turning have been significantly reduced.The research shows that the menthod of combined “cutting the shoal and filling the bottom”in narrow bends can effectively improve the flow pattern of the bend and reduce siltation on the convex bank.This method has been applied to the Huangpu River,and the research results can provide valuable references and guidance for the optimization of the Huangpu River waterway conditions and similar waterway regulation in the future.