With the summer rainfall data from 13 stations in Jiangsu from 1960 to 2000 and the NCEP/NCAR reanalysis monthly data,characters of summer precipitation in Jiangsu and its relations with Pacific SSTA(sea surface temperature anomaly) are investigated.Conclusions are as follows:obvious interannunal variations can be seen in summer precipitation,and the interannual precipitation change is positive.During flood(drought) years there was "+-+"("-+-")anomaly pattern at 500 hPa height field from low to high latitudes over East Asia.Correlation between summer precipitation and the index of East Asia monsoon is negative.Positive correlation was found between the north Pacific SSTA in the preceeded winter and the summer precipitation in Jiangsu,also between the eastern equatoral Pacific SSTA in the spring and the summer precipitation.