Abstract: In the course of processing in incomplete information systems, need extension of Rough set model. Now there are several Rough sets models,such as tolerance relation,similarity relation,and limited tolerance relation.However these models have certain limitation.In this paper,a new extension model base on k-equivalent degree tolerance relation is presented. By an example,it is verified the model is flexible and consistent with the actual situation.

摘要： 在处理不完备信息系统时，需要对经典粗糙集理论进行扩充。目前有一般容差关心，相似关系，限制容差关系等Rough集模型，然而这些模型还存在一定的局限性。本文对此进行了分析和改进，建立了基于k等价度容差关系的Rough模型。并通过实例说明了该模型具有很好的灵活性，得到的结果也更加符合实际情况。