Abstract: In this paper, the interannual variation of precipitation for 1951-1984 during the annually second rainy season in South China has been studied. The major results are as follows:1. There are 3-year perodic variation of precipitation and long-term variation of 10-year scale.2. There is a close relationship between preciptation and position of subtropical anticyclone over the western Pacific in summer during the second rainy season in South China . The rainfall amount is more when the position of subtropical anticyclone is located towards the north and towards the east or vice versa.3. The effect of ITCZ on the precipitation during the second rainy season in South China was investigated by using OLR data for 1974-1983. The results indicatae that The rainfall amount is more when position of ITCZ is located towards north and intensity of ITCZ is weaker or vice versa.