【摘要】To begin wirh.rhe paper reassure that the traditional indexes such as Paasche's index and Fisher‘s ideal index all have their own merits and limits,and then rhc econcomic interpretation of three kinds of indexes is described Based on the system ana}y515,the paper designs a index methodology system. The paper also combines the economic meaning of index with index system,thus builds a theoretical back- ground for China's factor analysis system.