Abstract:Based on the model IAP9-AGCMⅡ, the effects of the sea surface tempera ture anomaly (SSTA) in Tropical Southwest Pacific Ocean on precipitation are num erically studied. The results are indicated that when the positive SSTA takes pl a ce, in summer,the precipitation increases evidently in the tropical mid-Pacific of North Hemisphere, it is normal or increases in Eastern China. When the negat ive SSTA takes place, in summer,the precipitation decreases evidently in the eq u atorial mid-Pacific. It is normal or decreases universally in China. In short, t he best sensitive place for the SSTA in Tropical Southwest Pacific Ocean is the tropical mid-Pacific of North Hemisphere , Southwest and Central China ,Bay of Bengal and Indo-Chinese peninsula