Abstract: Based on the famous Penman formula and local observed meteorological data from 1993 to 2000, a calculated model of evaporation for Jiangxi province, which is in monsoon climate region, was developed. The difference of precipitation and evaporation during crop season were calculated to evaluate the local agricultural water resources. The results showed that there was a rich agricultural water resources in Jiangxi in general, but it was rich from March to June and short from July to October; And there was the spatial variation also, it displayed much more water profit in east than that of in west, and more in mountain than in plain region.

Key words: Evaporation model, Evaporation model, Penman formula, Agricultural water resources, Evaluate