In order to meet the positioning accuracy requirement of a specialized marine turbine shunt base, the surface finish, perpendicularity and dimensional accuracy were presented.Through the transformation and analysis of threeaxis conventional machining and fiveaxis directional machining,the multiprocess machining method, 3+2 fiveaxis directional machining method and simulation mean were used to ensure the machining effect.The results show that by using the fiveaxis positioning machining method,the machining time is greatly shortened, the machining efficiency is improved, and the position accuracy of each surface is guaranteed. This function has been widely used in the mold market.