In order to solve the problem of pipeline corrosion and vibration caused by cavitation after the throttling orifice of the feedwater recirculation pipeline with large flow and high pressure difference.. The design principle of fluid multi-stage choke orifice is adopted to design and determine that three choke orifices are required for the water supply re-ciculation pipeline of the actual ship. Numerical simulation verification using the mixed multiphase flow model shows that cavitation will not occur in the water supply re-circulation pipeline with three orifice plates. When two orifice plates and one orifice plate are used, the water supply re-circulation pipeline will have different degrees of cavitation. Therefore, this analysis method can be used to correct and optimize the pipeline corrosion and vibration problems after the orifice plate of the feedwater recirculation pipeline on a actual ship.