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The rational use of water during the grain-filling period can ensure the roots to protect the leaves, ensure smooth grouting, and increase the grain weight of grains. If water is insufficient during the later period of rice growth, the leaves will yellow earlier, resulting in reduced yield. Scientific research confirms that about 30% of the material needs to be synthesized and transferred into grains after the rice grows to the wax-cooking stage. Therefore, at the later stage of rice filling, it is still necessary to ensure sufficient water supply, and the soil moisture content can be 90% of the maximum water holding capacity of the field soil. In order to maintain the roots and protect the leaves, an intermittent irrigation method can be used in the later stage of rice growth, i.e., watering once, drying and recharging, and gradually reducing the time of accumulation of water in the rice fields as the rice matures. The last water cut before harvesting should be based on specific conditions. Flexible control. When rice matures, if the temperature is higher, the water transpiration is faster, or the terrain is higher, the irrigation and drainage are convenient, and the water cut may be appropriate later. Generally, it is appropriate to cut water 3 to 5 days before harvesting; when the rice is ripe, the temperature is low, and the soil is sticky. Heavy water may be appropriate earlier, and it is generally advisable to cut water 10 to 15 days before harvest.