Abstract: In allusion to increase redundance of the rules for some algorithm of attribute reduction with belong to attribute is basic unit. Put forward taking belonging to attribute value (logical value) as the basic unit, in the indefinite relation of the whole decision, the different degree of each logic value for the logic distance among the smallest items of different class is decided, taking its strength as the basis minimize the table of multipled logic by choosing strong and overlay, and by the examples proved that the rules extracted is minimized.