Through the finite element analysis, Workbench is selected as the platform, and the MOGA optimization algorithm is used to make a sensitivity analysis for the length and arrangement position of stern tube bearing and intermediate bearing respectively, so as to obtain the different sensitivity of each parameter during the shafting design. At the same time, the relationship between the arrangement position and length of bearing and maximum stress of shafting is calculated, so as to obtain the best optimization design scheme of ship shafting.