To some extent,the tolerance relation can overcome the problem that the indiscernable relation is too strict in the classical rough set theory,and the structuralization of the rough set can preserve the classified information of the data object.In this paper,the structuring technology is applied to the tolerance rough set model,and the structured tolerance rough set model is proposed.The proposed model is characterized by operator Φ,and its related properties are also explored.Since the upper and lower approximations of structured tolerance rough set are multisets of tolerance classes,they can effectively retain the structural information of objects.Finally,the inaccura-cy and the incompleteness of the proposed model are discussed.
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