The eastern shore protection of the first phase of the Yantian Port area east operation area container terminal project in Shenzhen Port adopts a vertical embankment gravity structure,which is installed layer by layer underwater with large blocks.Therefore,the installation accuracy and efficiency of vertical embankment blocks play a crucial role in the construction of the entire terminal project.Aiming at problems that underwater installation positioning of large blocks is difficult,installation accuracy cannot be guaranteed,and efficiency is low,we summarize climate and hydrological conditions of the construction water area,and propose the large-scale positioning frame and GPS (RTK) combined positioning and installation technology by the simulation analysis and similar engineering scheme research and comparison.The technology achieves high-precision,high-efficiency,and high-quality underwater positioning and installation of large blocks,and is used to successfully complete the task of underwater positioning and installation of large blocks.