Abstract: The basic principles of production association rule in rough set operation are analyzed first, and then the automatic process of production association rule acquisition is given.The numerical data is qualitatively processed by the classification of membership functions and membership degrees to get the normative decision table.The regular method of relations and the reduction algorithm of attributes are studied.The reduced relations are presented by the multi-represent-value method and its algorithm is offered.The whole production association rule acquisition process has high degree of automation and the extracted knowledge is true and reliable.