Abstract: Using the daily precipitation data and monthly sea surface temperature(SST) reanalysis data of 34 stations from Sichuan- Chongqing region from 1960 to 2010,and adopting modern climate diagnosis methods,such as point relevant and synthetic analysis,I have studied the characteristics of rainy season precipitation and SST background field in this region in this paper. The followings are my studying results. Number One,the average precipitation has been in unimodal distribution for many years and the rainy season is determined from May to October in Sichuan- Chongqing region. Number Two,in terms of time and space,the distribution of rainy season precipitation is uneven in Sichuan- Chongqing region,and the high value center of which is located in the area of Yaan and Leshan. Number Three,as for the variation of rainy season precipitation,the point correlation analysis shows that the following key ocean areas have significant negative correlation with Sichuan-Chongqing region. They are the east equatorial Pacific Ocean area,the north Pacific Ocean area,the equatorial Indian Ocean area,the south Indian Ocean area,the north Atlantic Ocean area and the equatorial east Atlantic Ocean area. The analysis is through the reliability of 0. 1 signicance test,which is also consistent with the synthesis analysis.