An analysis is made of the relationship between SSTA (Sea Surface Temperature Anomaly) over the offshore waters of the southern Asia and the precipitation in Yunnan from 1961 to 1999. It is discovered that the precipitation in early summer in Yunnan has a distinct negative relationship with SST over the offshore waters of the southern Asia, and the negative relationship is more obvious in the western North Indian Ocean and the Arabian sea than in the Bay of Bengal and South China Sea, but not obvious in middle summer. The results also show that the precipitation in summer in the southwestern Yunnan is positively related with the SST of the previous period over the Bay of Bengal, but the relationship is not obvious in other sea areas. The precipitation in summer in the southeastern Yunnan is positively related only with the SST of the previous period obviously over the South China Sea.