An experiment was conducted in the Yucheng Experimental Station to testify the validity and reliability of the evapotranspiration measurements by the lysimeter and the Bowen-ratio Energe Budget Method.The eddy-correlation technique was used as a reference for all the other methods,meanwhile,the aerodynamic method and the water balance method were also adopted in the experiment.The Yucheng Experimental region has high ground water talbe ranging from 3 to 1.5 meter,Particularly,in recent 5 years,the ground water table has raised by about 70 cm.