Abstract: The paper aimed at studying the soil moisture dynamics of red soil along slope farmland. Collected data showed that soil water status of peanut slope farmland changes along with periods of year rainfall, and location of slope farmland. The 0~150cm soil pondage is divided into three stages that are water surplus period, water consume period and water complementarities period. The soil potential is in accordance with the pondage stage the variety mutually, The soil potential of the current total from diminish to back up again greatly, just the soil layer is from the top bottom, the water potential of the current value enlarge, the water potential changes to let up, the 100 cm soil layer is as follows almost yearly stable. The higher soil water potential has, the more the frequency appears, ranking in saturation> wetness> wane> drought. The frequency of saturation- moist segment is ranked in the bottom soil> the subsoil> topsoil, down slope> up slope. The drought segment of low water potential appears on up slope, the soil surface and the dry season. Interflow appears on upland slope in rainy season. Saturation zone at deeper layer of down slope lasts longer time after a rain event while it lasts shorter or no at up slope. Rainfall has slight influence on soil moisture of upland during drought season.