ABSTRACT
In the study, Amazonia's forest evapotranspiration was calculated through equation proposed by Thorn & Olivier (1977). The datas are coming from nineteen Weather Stations distributed in the region. It remained confirmed which the contribution of aerodynamic term in the composition of evapotranspiration is similar to contribution of term associated to energy budget. It was found 7 mm/day for the average value of potential evapotranspiration.