Among the approximate distribution reduction algorithms based on rough set theory, there are mainly upper (lower) approximation and optimal approximation, which have some limitations in practical application. In more cases, it should be considered to discuss the distribution reduction results on the basis of any approximation to meet different application requirements. Therefore, the concept of one-sided approximation of rough set is proposed, A rough set model based on unilateral approximation is established. The properties of unilateral approximation of rough set and the relationship between unilateral approximation and optimal approximation of rough set are discussed. On this basis, the concepts of unilateral approximate reduction and unilateral approximate distribution reduction are proposed<br>
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