A empirical method for calculating the evaporation potential is discussed. It is the function of three factors:average air temperature, relative humidity and wind speed. The correlation analysis is made between the obtained values and Penman evaporation potential values, as well as evaporation capacity observed with a E601 Evaporimeter and a small-sized evaporimeter. The correlation coefficients are above the remarked level and very stable. It can be concluded preliminarily that the method is applicable to the local area, easy to understand, easy to use and can be used along with concerned indexes very well, for example Xerothermic winds. It obtained success in estimating the moisture profit and loss, and has significance in analyzing Xerothermic winds and droughts.
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