The torrential rain over the southern Haihe river basin during August 1996 (‘96.8’ event) was analysed by using real time observation,T63 model and satellite cloud picture data. The results are as follows: the ‘96.8’ event occurred in the circumstance of the sub tropical high of continual two times northward jumpping and a strong meridional circulation in the sub tropical area,the sub tropical high,typhoon 9608,mid and low level jet and low level weaker cold air from the Northeast to the North China Plain co operated to generate a stable cloud cluster of the rainfall,the developing MCC over the southern Haihe river basin brought about the continuous torrential rain.