Abstract: his paper puts forward the concepts of one direction variation S-knowledge, granulation degree and filter degree of one direction variation S-knowledge. Using these concepts, we further discuss the characters of granulation degree and filter degree about one direction variation S-knowledge. In the end , this paper presents the first mining principle and filter principle about one direction variation S-knowledge.

Key words: Variation S-rough sets, Elementary transfer, One direction variation S-knowledge, Granulation degree of one direction variation S-knowledge, Filter degree of one direction variation S-knowledge

摘要： 本文提出了单向变异S-知识、单向变异S-知识粒度、过滤度的概念。利用这些概念讨论了单向变异S-知识的颗粒特征、过滤特征。最后给出了单向变异S-知识的最先挖掘原理，变异S-知识的最先过滤原理。

关键词: 变异S-粗集, 元素迁移, 单向变异S-知识, 单向变异S-知识粒度, 单向变异S-知识过滤度