Abstract:On the basis of establishing the whole ship finite element model, the models of each service year are updated based on the corrosion model, and the direct calculations of yield strength and buckling strength of Floating Production Storage and Offloading (FPSO) hull structure are made by the self-developed software according to the specifications. The results show that the calculation results of hull structure strength in each service year of Life Cycle (LC) meet the standard values. Under the influence of corrosion damage, the yield utilization factors and buckling utilization factors of FPSO hull structure increase gradually; with the increase of service time, the growth trend of both accelerates gradually. The research results are of certain reference value for the design, maintenance and lifetime extension of FPSO.