Abstract:Soil saturated hydraulic conductivity () and its anisotropy ratio play an important role in soil hydrological processes,however, the vertical distribution of Ks anisotropy and its influencing factors remain unclear. In this study,, capillary porosity, total porosity, water content, bulk density, soil mechanical composition, organic matter content and other basic soil physical properties in different vertical and horizontal directions of three typical slopes in Taihang Mountain were measured, and correlation analysis was used to study the profile distribution of and other soil properties. At the same time, the vertical distribution of anisotropy ratio and its causes are discussed. The results showed that soil increased first and then decreased with the increase of soil depth in both vertical and horizontal directions. Soil in the middle slope increased first and then decreased with the increase of soil depth in the vertical direction, but decreased first and then increased with the increase of soil depth in the horizontal direction. The soil anisotropy ratio of the upper, middle and lower slopes was significantly different from that of 1, showing obvious anisotropy. is dominant in the horizontal direction of the upper and lower slopes, while is dominant in the vertical direction of the middle slopes. anisotropy ratio was significantly correlated with soil bulk density (r=0.478, p=0.021), and significantly correlated with total porosity and capillary porosity (r=-0.467, p=0.025. r=-0.459, p=0.027) were not significantly correlated with other soil physical and chemical properties, indicating that soil pore structure is the most important factor affecting anisotropy ratio. The above results are helpful to further understand soil and the main controlling factors of soil anisotropy, and can provide support for the study of slope soil hydrological processes in Taihang Mountains.