Abstract: Under cognitive mechanism, the concepts and logical formula of attribute granular was given throuth qualita- live mapping based on the characteristics of uncertainty knowledge processing. Qualitative mapping was established based on the transformation of the relationship between the properties of ctuantitative and ctualitative. The initial granu- lar logic system was constructed on this basis. Finally, the granular logical reasoning was described in the Petri net for- mal methods. I}hc results show that it is effective. It makes the thinking operation that is related to cognitive identifica- lion and judgement can get a better expression.

Key words: Qualitative mapping, Qualitative criterion transformation, Granular computing, Granular logic, Pctri net