In this paper,using meteorological data of 2 stations during 1957-2012in the Taolaihe River Basin, we analyzed the inter-decadal and inter-annual change of potential evaporation by linear trends and the 5- year trend of sliding,tested climate mutations on Mann-Kedall method,studied the cycle to climate change in wavelet analysis,the conclusions are following:(1)autumn and winter potential evaporation are relatively lower in1960s and1970s,but abundant in1980s,1990s and after 2000,while potential evaporation in spring and summer are also abundant during 1960s and1980s,and lower in1990s and after 2000.In addition,variation for annual and wet season potential evaporation are relatively lower in 1960s,1970s and 1980s,but abundant in 1990s and after 2000;(2)variation in annual and wet season potential evaporation tended to increase, which each season potential evaporation also has an obvious increase trend,and the largest increase occurred in summer,autumn followed;(3)seasonal and annual potential evaporation variation,there are about 10-years,15-years and above 26-28-years of cycle during 1957-2012;(4)mutation increase of the potential evaporation happened in the years of 1995,2000,1984,1980,1997,1992 for spring,summer,autumn, winter,annual and wet seasons,and what's more,only the dry season potential evaporation experienced two mutation increase,respectively,in 1980 and 1995.