关键词: 粒计算, 粒, 词计算, 粗糙集, 商空间

Abstract: Granular Computing （GrC） is theory which solves problems with imprecise，partial true，fuzzy and unnumbered information. It is conformity and transcendency of this kind of theories such as rough set，fuzzy set，computing with words，quotient space and interval computing etc. It covers all theories，methodologies，techniques，and tools which make use of granules. It takes proper approximate answer instead of optimal answer and it is supplement and development of the precise math. This article introduces the content of Grnular Computing，explains the feasibility and necessity of studying Grnular Computing，explores basic problems of Grnular Computing，shows some main theories of Grnular Computing and their comparison. Also it proposes Grnular Computing’s further investigation objects，for example，using defined mode for references in Granular Computing.

Key words: Granular Computing（GrC）, granule, computing with words, Rough Set, quotient space