Abstract: Pot, plot and field experiments with lysimeter were conducted at an irrigation experimental station to investigate water requirement of rice and soil moisture changes in paddy field. The relationship between soil water condition and evapotranspiration intensity of rice was discussed. The effect of different irrigation models on evapotranspiration of rice and the effect of soil water stress on rice yield were studied. Water saving and high yield irrigation models of rice and soil moisture potential control criteria are suggested.