Make use of the climatic data during 1971—-20()6 observed by 1 1 meteorological stations in Bazhou regions of Xinjiang，the potential evapotranspiration in every station were calculated with the Penman—Monteith equation recommended by FAO in 1998，and the spatio-temporal changes of the variation characteristics of potential evapotranspiration in Bazhou regions were analyzed．The main results show that：(1)The reduced tendency of potential evapotranspiration was remarkable in recent 36a．the decline tendency rate was -42.1mm·(10a)-1；(2)The interdecadal variation characteristics of potential evapotranspiration were declined sequentially at 1970s，1980s and 1990s，but since the beginning of the 21st century，2001—-2006，it Was presented to rise again；(3) In recent 36a，it does not have remarkable cyclical change on less than 36 years；(4)The abrupt change detection indicated that the annual potential evapotranspiration reduces suddenly in 1980；(5)The most main spatial distribution characteristics about the annual potential evapotranspiration were the synchronous variations；(6)the annual mean potential evapotranspiration have good multidimensional linear Regression relations with the altitude and latitude in Bazhou regions．