This paper attempts to deal with model of Granular Computing theory. Starting with granular set, it defines the generalization-specialization relationship between the individual objects of a granule, the pan-inclusion relationship between the granules, and proves that they are the partial ordering relation, and the granular set with partial order relation is a category.Offering the pan-intersection operation of the granular set, it further illustrates the construction method of granular category based on pa...