Based on the analysis of the experimental data, the models of water-production function (WPF) for rice, which can be applied to both northern and southern parts of China, are investigated The regularity ofthe variation of water sensitivity parameters in various models has been discussed It is suggested that Jensen model is the applicable model of WPF for rice in China The regularity of the variation of water sensitivity index λ. in Jensen model with the hydrology yeats and regions, especially, the relationship between. λ and the reference evapotranspiration ETO has been presented Thus. the principle and methods for widening the ranges of time and space for applying WPF of rice have been established.