This study was based on the precipitation data since 1960 from 17 weather stations in Xilinguole League and related areas.The interdisciplinary knowledge between meteorology and ecology was used and eco-geographical regions were divided according to the meteorological stations.The cycle regularity of precipitation and the difference among the eco-geographical zones were discussed with the aid of wavelet analysis method and Matlab software.Results showed that there was obvious cyclical change of precipitation sequence in Xilinguole League at the inter-annual scale from 1960 to 2007.There was an obvious signal of 25~32 year cycle of annual precipitation in 4 eco-geographical zones,but the periods of lack and abundance precipitation were different among the zones.According to the cycle characteristics,we can infer that in the next 15 years after 2007,Xilinguole League and related areas are in a state of persistent drought.