The climatic features of the beginning time of flood seasons in the Sanxia reservoir region from 1961 to 1994 is analyzed in detail.The dates of the beginning time of flood seasons in the reservoir region are compared with those in the middle and lower reach of the Yangtze River.It is found that they are almost synchronous on the whole.In addition,the times and the spatialtemporal distribution of all kinds and levels of heavy rain in the reservoir region are investigated.The results show that the number of days of heavy rain in the eastern part of the region is more than those in the western part on average.