The experiments were carried out using three paddy rice of Gangyou 527，Diyou 363，and Shanyou 63 in farmland experiments to study the effects of four irrigation regimes [ dry cultivation（DC），damp irrigation（DI）， the treatment C that controlled damp irrigation before booting stage，shallow irrigation at booting stage， wetting-drying alternation irrigation from heading stage to mature stage，and submerged irrigation（SI）] on characteristics of functional leaves at the full heading stage. The results indicated that the treatment C and DI have high functional leaves area and chlorophyll content，and have excellent upright habit of functinal leaves，and are favorable to the growth of functional leaves at the full heading stage, but the treatment DC inhibited the growth of functional leaves