Evapotranspiration is a combination of energy circulation and terrestrial water circulation.It has significant meaning to accurately monitor and estimate evapotranspiration for water resources planning,agriculture water saving research,crop yield simulation.This paper takes improved salinized land in Fuping county of Shannxi province as the research object, based on the measured data of eddy covariance method, Hargreaves-Samani method (HS method), modified Pangman-Montis method (PM method), and Priestley-Taylor method were used to estimate the actual evapotranspiration (ETa) of salted farmland, and the accuracy of these estimation methods under different time scales, different growth stages and different weather conditions were compared and tested to provide reference for estimating the evapotranspiration of salted farmland. The results showed that P-M method is the best, then followed by P-Tmethod, while HS method is the worst in the research period. The P-T method is more suitable than the P-M method considering the calculation method and the difficulty of the demand data.