Long-period infragravity wave can significantly increase the movement of moored ships in ports,affecting loading and unloading efficiency,and even causing cable breaks and damage to both ships and terminals.Taking the Chancay project in Peru as an example,combined with engineering cases worldwide that are affected by long wave,study on optimization of the layout plan of the port area is carried out.Dynamic mooring analysis models are used to compare and validate different layout schemes,leading to gradual optimization.The results show that the causes of long wave are complex,and the key factors affecting mooring stability include curved coastal topography,entrance dimensions,and wave energy concentration in narrow and cornered waters.Optimization strategies include adopting fully enclosed impermeable structures,controlling entrance dimensions,minimizing narrow water areas,and avoiding zones with concentrated wave energy.The research results can provide a reference for the planning and design of port areas under the influence of long wave.