SVD analysis of the relationship between northern Jiangnan Meiyu season precipitation anomalies and sea surface temperature anomalies(SSTA) shows that correlated SSTA distribution displays a pattern of west-positive-east-negative.The key region is just located in the most significant correlation area.The time period of the significant SSTA impact is from October to December in the previous year,i.e.the SSTA in the period is closely positively correlated with the Meiyu precipitation in northern Jiangnan.Under the influence of the SSTA pattern,the precipitation anomalies in the following Meiyu period in northern Jiangnan would exhibit a in-phase feature,and the most remarkable correlation region is the south part of the lower reach of the Changjiang River.