Based on the existing theory of including degree, it is proposed first about the concepts of rough truth degree and rough degree of an element , and the concepts of rough similar degree and rough including degree between two elements in some special rough logic algebra, which can be used in the approximate reasoning with rough information. Furthermore, their properties are studied in detail.%基于已有的包含度理论,在一类特殊的粗糙逻辑代数中首次引入了元素的粗糙真度,粗糙度等概念.进一步,引入了针对两个元素的粗糙相似度及粗糙包含度的概念,详细研究了它们的性质.这些概念可用于展开带有粗糙信息特征的近似推理.
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