Recently,US nuclear power plants(NPPs) have gained excellent achievement and keep ahead of the world.To a great extent,the Maintenance Rule(MR) has played an important role in this result.In this paper,the requirements of MR and implementation method of US NPPs are analyzed.Finally,based on the risk-informed safety classification of the structures,systems and components(SSCs),an MR implementation project which is applicable to NPPs in China are put forward.