A network of about 30 basic and more than 150 ordinary irrigation experiment stations for observing the evopatransptration of rice the soutern and middle parss of China has been formed. In this paper, based on the analysis of the observation data from the majority of the besic and a port of the ordinary stations, the patterns of vanation of evaputran-sptrotian of rice in space and time are expounded. Based on the inference, calcutation. and verification by the observation data from the above stations, the main method for cal-culating the evapotransptration of rice in China are exponded and recommended. In par-ticular, three new methods are introduced and discussed Finally. the method and results of making the isoline maps of evapotranspiration of rice in China are introduced.