Abstract: Three dimensional finite element method is applied to stress analysis of a propeller hub taking centrifugal load,aerodynamical moment and blade centrifugal tension load.Since its construction is complicated,loads are various and its stress distribution is hard to analyze,the elastic stress plus principle is employed for this purpose.The analytical results show that the blade centrifugal tension load is predominant and its construction has been optimized to a certain extent due to current improvements during long time of its service and modifications so the stress distributions of its parts are quite even and reasonable,moreover safety coefficients are large enough.