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Reference evapotranspiration (ET0) is a key parameter in hydrological and meteorological studies.In this study, the FAO Penman-Monteith equation was used to estimate ET0, and the change in ET0 was investigated in China from 1960 to 2011.The results show that a change point around the year 1993 was detected for the annual ET0 series by the Cramers test.