Abstract: According to the definition of concentrative precipitation in meteorological disaster indexes of double cropping rice in Jiangxi province,the characteristics of concentrative precipitation during April to September in Jiangxi province from 1971 to 2008,including the variation of concentrated period of precipitation,occurrence times of concentrative precipitation and average rainfall per station,was analyzed,by using statistical and trend analysis method.The results showed that concentrative period of precipitation was mainly distributed in the northeastern of Jiangxi each year,which was twice in the southwest,and usually happened from mid-June to early-July.The occurrence times of concentrative precipitation increased at the rate of 8.2/10y,and the average rainfall per station in concentrative period of precipitation increased at the rate of 3.7mm/10y.Both the occurrence times and the average rainfall per station in concentrative period of precipitation were more in the 1990s.And they were more from mid-June to early-July every year.

Key words: Concentrative period of precipitation, Concentrative period of precipitation, Occurrence times, Average rainfall per station