Based on the monthly mean precipitation data at 160 stations of China and 59 stations of Jiangsu during 1961-2004,the Lamination Cluster Method is firstly used to divide total Jiangsu region into three subregions,i.e.the north to Huaihe River(Region Ⅰ),the in-between of the Yangtze River and the Huaihe River with their riverside areas(Region Ⅱ),and the southern Jiangsu(Region Ⅲ).On this basis,the investigation is focused on the spatial and temporal variations of summer precipitation anomalies over the three subregions as well as their possible relationships with other areas in China.Results show that the summer precipitation anomalies over the three subregions exhibit remarkable interannual and interdecadal variations,but the variations are inconsistent in different subregions,especially the interdecadal variation with very evident difference between the south and north to Huaihe River.The quasi 5-yr and quasi 9-yr interannual variations of summer precipitation anomaly exist in most areas south to Huaihe River with an increasing interdecadal trend appreciably,and the 12-15-yr interdecadal variation does in the regions north to Huaihe River and the southern Jiangsu,meanwhile an decreasing interdecadal trend occurs in the north to Huaihe River.Moreover,the summer precipitation anomaly in Jiangsu is usually out-of-phase with that in Hetao area,the northern North China and the southern South China.