The large open oil terminal area in Lanshan Port Area of Rizhao port is planned to build four berths over 300，000 DWT. During the trial operation period of the first project，due to the influence of the construction of the adjacent operation area，the flow field of the wharf area has changed，which is not conducive to the wharf operation. In order to improve the flow field of the existing large open wharf area，the planning layout is adjusted. The land area behind the wharf is used to play the role of diversion dike to guide the flow field，reduce the backflow intensity，and improve safety of berthing.This approach does not adversely affect the surrounding project areas and has formed a win-win situation. The experience summary of this project can be a positive reference for similar projects in the future.