The jacket dolphin structure,as a type of lightly open wharf ,has a great potential to be used in the complex offshore deepwater environment.In order to solve the problem of diverse and reasonable selection of jacket structure,relying on the 300，000 t crude oil terminal project in Zhoushan Cezidao,a research on the structural selection of jacket pier is carried out,and the influence of structural layout factors on the performance of the optimized jacket pier is analyzed.The analysis results show that the mechanical properties of the X-shape jacket structure are the best,while the economic performance of the two K-shape structures is the best.According to the stress characteristics of offshore deepwater wharf,X-shape jacket structure is preferred.The analysis of the influencing factors of the optimal structure shows that the number of supporting layers and the slope of the measured leg column on the back sea have a large impact on the structural performance,while the height of the supporting layers has a large impact on the horizontal rigidity and a small impact on the bearing capacity.Therefore,it is necessary to optimize the parameters according to the load and deformation requirements of the jacket structure and the bottom pile foundation.