湘早籼２０号是采用辐射与杂交相结合的方法选育而成的１个迟熟偏早的高产优质抗病早籼新品种。本文就该品种的选育经过、主要特征特性、栽培技术要点及生产示范表现等进行了叙述。并对湖南省水稻诱变育种的新进展、育种目标及选育方法等方面的问题进行了讨论。 Xiangzaoxian 20 is a late-ripening high-yield and high-quality early indica rice variety which was bred by a combination of radiation and hybridization. This article describes the breeding of the variety, the main characteristics, cultivation techniques and production demonstration. And discussed the new progress of mutation breeding in Hunan Province, breeding objectives and breeding methods.