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In order to propose a more accurate forecast methods suitable for the reference crop evapotranspiration of rice in Jiangxi Province, this paper uses the PM formula and the historical meteorological data of 26 meteorological stations to calculate ET0, and uses this as a reference value to calibrate the Hargreaves-Samani (HS) model, the Blaney-Criddle (BC) model and the McCloud(MC) model. Weather forecast data is used to evaluate the applicability of the three ET0 forecast models at various stations in Jiangxi Province. The results show that after parameter calibration, the average accuracy rates of ET0 forecasts of HS model, BC model and MC model at 26 stations are 86.63%, 85.81%, 87.12%, and the average absolute errors are 0.75, 0.80 and 0.76 mm/d, the average root mean square errors are 0.98, 1.00, 0.99 mm/d, and the average correlation coefficients are 0.76, 0.76, 0.78, respectively. 16 stations recommend using the HS model for ET0 forecasting for the stations in Jiangxi Province, the HS model has the best forecast accuracy, followed by the MC model, and the BC model is the worst. On the whole, using the calibrated HS model for forecasting can provide more accurate ET0 forecasting data for irrigation forecasting and decision-making in Jiangxi Province. [ABSTRACT FROM AUTHOR]