Abstract: In this paper,the attributes relative table in 3 is analyzed in detail, and the concept of attributes analysis table and the constructing rules are presented. The concepts of associated attributes analysis table, both-hands meta-attributes analysis table, pure both-hands meta-attributes analysis table, etc. are also presented, and the relevant operations are defined. Finally, an algorithm to find the candidate key, whose cardinality is M, based on the attributes analysis table, is given.