This paper takes a typical oversize shore-connecting approach bridge in an open-sea area as an example to compare the technologies and economics of lower pier structure schemes.This study considers many problems of this approach bridge, including its large construction scale, complex geological conditions, a high proportion of the lower pier structure in the engineering investment, poor wind and wave conditions, short working time, and difficult control over the construction period.The comparison indicates that the high-pile pier structure is better in the application.Moreover, according to the characteristics of a large number of engineering piers and high standardization of scale, the paper proposes an optimal design scheme for prefabricated piers.The results show that the application of the structure greatly reduces the amount of concrete pouring on site, and the structure provides a favorable guarantee for reducing the construction difficulty and safety risks during construction and ensuring the construction period.The research can provide a reference for the design of similar offshore hydraulic buildings.