[Objective] The spatial variability of saturated permeability coefficient of lower layer of cultivated soil was researched to understand the influence of water infiltration on loess landslide in South Jingyang Plateau.[Methods] The horizontal and vertical saturated permeability coefficient of 54 loess samples were measured from the variable head permeability test and analysed using traditional statistics and geostatistics methods.[Results] The saturated permeability coefficient of the trench sampling area was 0.01~10 m/d and the permeability coefficient of the adit sampling area was smaller than that of the trench area, with its range of 0.0001 to 1 m/d. The spatial correlation degree of the vertical direction of the trench sampling area is medium, and the variation range is 5.05; horizontal spatial correlation degree is strong, change range is 3.50. The spatial correlation degree of the vertical direction of the adit is medium, and the variation range is 17.46. For horizontal direction, its correlation is weak with a range of 16.00.[Conclusion] The variability of saturated permeability coefficient in loess slope is larger.