用室内模拟方法测定红棕紫泥土壤的吸水速度，毛管水上升速度以及土壤水分的蒸发速度，以研究土壤抗旱机理。结果表明：在相同土层厚度（１００ｃｍ）下，红棕紫泥土壤的抗旱力为石骨子土＞二沙土＞二泥土。土壤有效持水量、水分移动性和蒸发性是决定红棕紫泥土壤抗旱力的最重要因素。 Indoor simulation method was used to determine the water absorption rate, capillary water rising rate and soil water evaporation rate of red-brown purple soil to study the mechanism of soil drought resistance. The results show that under the same soil layer thickness (100cm), the drought resistance of red brown purple soil is Shiguzi soil> two sandy soil> two soil. Soil effective water holding capacity, water mobility and evaporation are the most important factors that determine the drought resistance of red brown purple soil.