Abstract: This test uses a single-factor repeat tests, explore the effect of different ways of controlling water irrigation on root growth of rice. The results show that different irrigation ways has different impact on rice roots, the appropriate control of irrigation water can increase the length of rice root, number, root volume and the weight of dry matter, and can enhance rice root activity; controlling water irrigation to save water 2625 m3/hm², raise Rice Yield 580.35 kg/hm².