In terms of both long-and short- range annual and decade rainfall data from the east part of the Dabie Mountains,the theoretical probability distribution of precipitation in several segments are calculated.Results show that the theoretical pattern based on 2-3 year dataset and the indirect model coincides quite well with that from long-term data and thus has considerable usefulness.As such,this model for estimating the mountain rainfall with a certain part guaranteed annually is of great value,In the end,the utilization of the rainfall resources is addressed.