From the special terrain geological and hydrological conditions in the fluctuating backwater area of the Three Gorges Reservoir area,taking the proposed third stage project of Cuntan as an example,this paper compares the feature of structural type,analyzes the construction method and determines reasonable construction water level,optimum design of bent span and foundation pile diameter on overhead vertical wharf structure,and proposes a large-diameter-pile and long-span overhead wharf structure pattern adap...