Floods occured frequently in southern part of the south of Yangtze River valley during early summer from middle May to middle July.Based on the daily precipitation data from 200 stations in the south of Yangtze River valley during 1961—2010,this paper studies the temporal-spatial distributions and evolution characteristics of the early summer precipitation.Results show that,as the transition for the Early Rainy Season in South China to the Meiyu period in the Yangtze-Huaihe River Basin,the East Asia summer monsoon rain belt takes a stay over southern part of the south of Yangtze River valley,which brings about the distinct precipitation concentration period and concentrated region during the early summer.The concentrated region lies between 27.5—29.5°N,around the boundary of Zhejiang,Jiangxi,Fujian and Anhui provinces about.The precipitation concentration period occurs from 10 to 30 June.The early summer precipitation and rainstorm days have not conspicuous increase or decrease trend but the longest continuous rain days are reduced slightly in this region in recent 50 years.The early summer precipitation has significant 2—3 and 5—6 years periodical oscillations,and there are three abrupts occured in 1979,1987 and 2001.