Abstract：The spatial distribution of the flood period rainfall over the years in Zhejiang central region is analyzed and it is shown that the rainfall amount in northern and southern part is more than that in central part, and the precipitation in western part is more than that in eastern part. June precipitation is the greatest during the annual flood season. There is a nine-year cycle throughout the precipitation sequence. Four-year cycle exists from 1967 to 1982, and five-year cycle appears since 1978 until now. Zhejiang central region flood season precipitation is mainly affected by the disturbances of the high-middle latitude atmospheric circulation system in both of northern and southern hemispheres, and the number of circulation sensitive areas in northern hemisphere is greater than that in southern hemisphere. Forecasting model is established by using multiple linear regression method. And the results of the forecasting model simulation are close to historical observations. The prediction equation passes 95% reliability test. The applicability of the prediction equation is tested by using 2009 data and the results show that the qualitative prediction is successful.