In terms of 1954～1989 summer (June～July) rainfall over South China and monthly mean global SST, study is undertaken of the relationship between the South China summer rainfall (SRSC) and SST. It turns out that SRSC is negatively correlated to the previous January SST over the western North Pacific at a significant level, suggesting that anomaly increase (decrease) of the SST aforementioned is beneficial to summer flood/drought over South China. Results further indicate that noticeable negative correlation between SCSR and SST is maintained over the Philippines and its surroundings, mid latitude North Atlantic during the previous spring and summer with its great significance to predicting summer flood/drought in South China.