Research on the Approach of Rules Extraction Based on Concept Granule

By introducing the concept of concept granule, this paper firstly presents the method of describing and measuring rules in concept granule form and tries extracting complete concept granule by using the change of concept´s intension and extension. Secondly, this paper point out that different complete concept granule stand for different concept level and generate rules by searching concept level in decision system according to customer´s expect.