In this study,based on the monthly sea surface temperature data and daily rainfall of 753 stations over China,11 subdivisions of summer rainfall in eastern China were found by using the rotated empirical orthogonal function(REOF),and other methods.The 11 subdivisions of summer rainfall were shown by statistical methods to be independent from each other,which differs from the three types of summer rainfall patterns of eastern China,thus representing the connection of summer rainfall in eastern China.Based on the interdecadal variation of the relationship between ENSO and 11 subdivisions of summer rainfall,three categories of the correlation between SSTA in the Niño3 region and summer rainfall were defined by means of moving correlation,composite analysis,etc.:In the first category,the correlation is always very week in the long term,such as in northeastern China,the middle and lower reaches of the Yangtze River,south of the Yangtze River,the Fujian-Jiangxi area,and the Qiongzhou Rim strait.In the second category,the significant correlation is fairly stable,such as in the Hetao area and middle and lower reaches of the Yellow River.In the third category,the relationship shows noticeable changes,as such as in the Liaoning-Jilin,Yellow River-Huaihe River,Huaihe River and Guangdong-Guangxi areas.In the fourth category,the abrupt year of the interdecadal variation of the relationship between ENSO and four subdivisions of summer rainfall in eastern China differ.The correlation between SSTA in the Nino3 region and the summer rainfall in the Guangdong-Guangxi area abruptly changed in 1975.However,the relationship between ENSO and summer rainfall in the Liaoning-Jilin and Yellow River-Huaihe River areas was weak after 1980.The interdecadal variation of the relationship between ENSO and summer rainfall of the Huaihe River occurred around 1985.