This paper analyzed the relationship between the pan evaporation and actual evapotranspiration based on the complementary theory using observation data of Qomolangma Atmospheric and Environmental Observation and Research Station, Chinese Academy of Sciences (Qomolangma station) in the Qinghai-Xizang Plateau.The results show that, the value of ε in wet season (June to September) is less than that in the annual, the value of ε in dry season (January to May, October to December) is the maximum.Secondly, this paper estimated the actual evapotranspiration in the Qomolangma station.The results show that, the calculated actual evapotranspiration is more close to the observed value in wet season, and not close to the observed value in dry season.At last, pan evaporation are not greatly affected by relative humidity in dry season, which results that the calculatedactual evapotranspiration is not close to the observed value.So the complementary theory is more suitable for the wet season.
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