By comparing the differences between Floating Production Storage and Offloading (FPSO) and conventional hull, the new requirements for main deck structure of hull are proposed, and the module stool, single point cabin and other structures are added. Combined with the technical requirements of FPSO construction, the finite element analysis is made on the hull sections to determine the section joints reasonably, the docking blocks in single point cabin area are arranged and designed, and the special construction process analysis is made for the special structures such as single point cabin, module stool, etc. to formulate the feasibility process scheme and precision control measures. Through the engineering practice, the single point cabin and module stool of key structures all meet the construction precision requirements. The process can provide reference for the subsequent similar offshore structure construction.