Abstract: Attribute granular computing can simulate the cognitive functions of human brain,such as granulation,orga-nization and causation,but it lacks of a formal mechanism for the reasoning process．Petri net has asynchronous,concurrent and uncertainty characteristics,which is similar to the characteristics of some cognitive activities in human thinking process．The basic concept and logic calculation rules of attribute granular computing were put forward in this paper．The Petri net was properly extended based on qualitative mapping．Some basic elements of a cognitive system,such as knowledge representation,reasoning,learning and memory mode were initially showed in the extended Petri net．The results show that this method can reflect the cognitive process of uncertainty identification and judgment in a certain extent．This model provides a new convenient tool for Petri net in the study and stimulation of human’s advanced intelligence and image thinking．

Key words: Cognitive model,Granular computing,Qualitative mapping,Fuzzy set,Petri net