Long-period waves have a great impact on ship operations. A new solution to the problem of berth operation efficiency affected by long-period waves is proposed. That is，through a series of methods such as multiple mathematical models and feature analysis in the ocean and port，the operation efficiency of berths affected by long-period waves is obtained. Through a series of calculations and analyses of a certain port，the average berth operation efficiency under different control standards is obtained，which verifies the rationality and operability of the method. This method is of great significance to the construction of port projects that are affected by a long period and have no measured data or a short measured data period. It also provides a reference for similar projects in the industry.