中文摘要：

为了实现模糊信息系统属性约简问题，探讨一种基于正域类的模糊属性约简方法。利用模糊二元相似关系建立模糊相似类的方法，进而定义决策属性关于条件属性的模糊正域类，得到正域类属性的重要度。结果表明：一方面，实现模糊信息系统属性约简；另一方面，通过取不同的相似精度，得到不同属性约简集。

英文摘要：

In order to achieve attribute reduction in fuzzy information system, a fuzzy attribute reduction method is discussed based on the fuzzy positive domain. Fuzzy similarity class is established using fuzzy binary similarity relation methods. Thereby a decision attribute on condition attribute fuzzy regular domain classes is established and positive domain class attribute importance extent is obtained. The results show that： on the one hand, fuzzy information system attribute reduction is achieved; On the other hand, different similarity precision is taken and a different set of attribute reduction is gotten.