Using ECMWF/WMO daily data of the summer of 1982,the relation of South China rainfall to large-scale water transporting flows and the atmospheric heating environ-ment is investigated.Results show that the intraseasonal(30～60day) oscillation of the flows from the Bay of Bengal and the western Pacific can modulate the South China precipitation and that the rainfall is well correlated with the atmospheric heating field. After the estabil-ishment of summer monsoon the intense rainfall over South Chnia is highly associated with the heating condition of the region,the intensification (weakening) of the apparent heatsource and the moisture sink corresponding to the abundant(deficient) precipitation in thispart of China.