Based on the present situation and development requirements of Xinhai Harbor，we establish the simulation model of the ro-ro dock harbor system to deal with the problems that whether the actual capacity of the ro-ro dock can meet the transportation demand,especially the adaptability of the pier capacity during the peak period.By simulating the operation process of ro-ro dock and the operation of it during peak hours under different working conditions,we explore the factors affecting the wharf’s throughout capacity.According to the research,insufficient consideration of the impact of the water area condition and the vessel operation on the wharf capacity will result in that the capacity of some newly added terminals cannot be fully utilized.It is suggested that in the similar project planning and construction,the research on the coordination of the channel capacity,the port capacity,the terminal capacity and the onshore supporting facilities should be strengthened to ensure that the capabilities of each system can be fully utilized.