The port is a special engineering subject with performance requirements as the ultimate goal.The breakwater guarantees the safety and performance requirements of the port,and it plays an important role in the general layout of the port.Based on the port project of a power plant in Pakistan,we determine the performance requirements of the port area by the coal-fired recharge and consumption model of the power plant under the conditions of the mid-long period wave surge,use the numerical simulation analysis to establish the relationship among wave height,period and ship motion,apply it as an important standard for the protection effect of the island-type breakwater,and determine the general layout scheme of island-type breakwater reasonably.The results show that the second scheme is the final design scheme,which can meet the requirements of annual operation time.