According to the monthly precipitation data of 120 meteorological stations in Chongqing and Sichuan during 1960-2006, the precipitation distribution in these areas was analyzed. At the same time, by correlation analysis, crosswavelet transform, the relationship between the precipitation over Chongqing and Sichuan and SST in Nino3 and its stability were also analyzed. The main results are as follows: the consistent anomaly distribution is the main spatial model of precipitation variation in Chongqing and Sichuan. The first mode time series of EOF had good relationship with SST in Nino3. This relationship manifested that in the warm phase of SST in Nino3, the precipitation in Chongqing and Sichuan was less, while, in the cold phase, more. The precipitation in Chongqing and Sichuan had good relationship with SST in Nino3 in quasi2 a, 4-6 a periodic changes, but this relationship was not stable. There were good positive and negative correlations during 1960-1986 and 1987-2006 respectively.