Abstract: Information granulation has attracted much attention for simulating the way humans analyze and deal with complex problems．Considerable strides have been made on theory and method of information granulation, typically based on fuzzy set theory, rough set theory, quotient space theory and so on, where fuzzy information granulation aims at handling problems and phenomena with fuzziness．In this paper we review establishment and development of fuzzy information granulation, sort out systematic structure of fuzzy information granulation．We summarize the extensive applications of fuzzy information granulation in fields such as clustering, forecasting and association rules mining．