在序信息系统中通过“逻辑与”将变精度粗糙集与程度粗糙集融合起来,建立一种新的粗糙集模型,对模型区域做出了精确的刻画,而后深入的研究了其数学性质,文末通过学生成绩这一案例进行分析体现本文的研究意义。序信息系统下变精度与程度的“逻辑与”粗糙集是对经典粗糙集理论的延伸和推广,为序信息系统的知识发现提供了新的理论基础。 In order information system, the “rough set” of variable precision rough set and the degree of rough set are merged by “logic and ”, a new rough set model is established, the model area is accurately portrayed, and then the mathematical Nature, the text at the end of this case through the analysis of student performance reflects the significance of this article. The “logical and rough set” of the precision and degree of the descending orderinformation system extends and popularizes the classical rough set theory and provides a new theoretical foundation for the knowledge discovery of the sequential information system.