Based on the area rainfall data in the upper reaches of Three Gorges (including five valley:Wujiang, Chongqing-Wanxian, Wanxian-baqu, Jialingjiang, Mintuojiang) during 1951-2000, the drought/flooding distribution characteristics and its cause in May, June, July, August and summer in the Yangtze Gorges are analyzed. The impact of some main circulation systems on the area is studied, and the prediction models of various basins area rainfall are established respectively. The model predictions are successful during the years of 2000, 2001, 2002.