With respect to extension of rough set theory under incomplete information systems, rough set modal based on class similarity relation is proposed in this thesis, this modal can reclassify to objects through equivalence partition of domain values.

• 在不完备系统下的粗糙集理论的扩充方面，提出了一种类相似关系的粗糙集模型，该模型通过对域值的等价划分，可对对象进行重新分类。