研究了我国燥红土的土壤持水性和土壤水分物理性。通过对燥红上水分周年动态观测，分析了燥红土的土壤水分年循环规律，以水量平衡法研究了燥红土在湿润期向干少期转换的土壤水衰退过程。并以土壤有效水贮量为参数计算和分析了燥红土的有效供水与作物（玉米）需水间的耦合关系．指出拔节─抽穗是水分亏缺关键期。提出了抗旱和耕作、砂石等覆盖法，调整作物种植期，适时集中灌溉，罐渗法等节水农作措施。 This paper studied the soil water retention and soil water physical properties of dry clay in China. Based on the annual dynamic observation of moisture on dry red soil, the annual cycle of soil moisture in dry red soil was analyzed. The water balance was used to study the soil water decline process of dry-red soil. Based on the available soil water as the parameter, the coupling relationship between the available water supply and the water requirement of crop (maize) was calculated and analyzed. Pointed out that jointing ─ heading is the key period of water deficit. Proposed drought and tillage, gravel and other coverage method, adjust the crop planting period, timely focus on irrigation, pot seepage method and other water-saving farming measures.