The paper adopts the Penman-Monteith method which was redefined by the FAO in 1998 to calculate the reference evapotranspiration in Hanjiang River basin and the Mann-Kendall trend test and the spatial interpolation method to analyze the temporal and spatial trends of the reference evapotranspiration in the Hanjiang River basin in all the year during 1961-2000.

The relationship between precipitation and reference evapotranspiration in various hydrological years was analyzed and the items of reference evapotranspiration were compared.

Comparative study on Priestley-Taylor and Penman methods in calculating reference crop evapotranspiration;

A Fourier series model for forecasting reference crop evapotranspiration;

Dynamic variation characteristics and tendency of reference crop evapotranspiration in the longitudinal range gorge region;

Long-term correlation and multi-fractality of reference crop evapotranspiration time series;

Multi-time-scale analysis of evapotranspiration based on wavelet transform

Our research is an attempt to estimate monthly evapotranspiration in the Taizi River basin from1960 to 2005 by using the Hargreaves equation and Penman-Montieth equation.

Analysis of the change characteristics and effect factors of reference evapotranspiration in Taizi river basin;

Temporal and spatial characteristics of reference evapotranspiration in China;

Stochastic characters of reference evapotranspiration and precipitation of Xiaohe Irrigation Areas,Shanxi Province;

Predicting reference evaportranspiration based on artificial neural network with genic arithmetic;

To discuss the feasibility of utilizing the radial basis function artificial neural network (RBF ANN) model and to predict daily reference evaportranspiration,five different kinds of model inputting factors’composition are made and their correlative influences on the model’s forecasting precision are studied.

The Elman neural network,which is a dynamic neural network,is used in reference evaportranspiration prediction.