Attribute　reduction　is　often　used　in　simplifying　decision　table　in　rough　set,　but　as　far　as　a　specific　rule　is　concerned　attribute　value　reduction.　In　this　paper,　through　analyzing　the　nature　of　reduction,　we　have　obtained　a　simplified　algorithm,　moreover,　we　can　verify　the　validity　by　some　test.　©　2005　IEEE.