Abstract: Soil-water characteristic curve (SWCC) is the constitutive-curve to reflect the basic characteristics of unsaturated soil, which plays an important role in seepage and mechanical mechanism analysis for unsaturated slope. However, subjected to the limitation of experimental equipment and testing technique, it is usually time consuming and difficult to acquire the soil-water characteristic curves. It is difficult to acquire the SWCC in a whole suction range (0~106 kPa) for the existing testing methods. Problems such as distorted results caused by multiplicity of inversion and interpretation are common. The existing tested SWCC are mainly focused on the Malan loess (L1), and the results for its following layers of loess and paleosol soil is almost blank. Take the Luochuan loess section at Yan'an city Shaanxi province as an example, the basic physical parameters, the material contents and the SWCCs have been experimented for the 29 layers of loess and paleosol soil by introducing the Transient Release and Imbibition Method (TRIM) technique has been introduced in this paper. And the standard profile for unsaturated engineering properties is established. Based on the comprehensive analysis of the parameters, it is observed that the different physical parameters of the soils at each layer change with depth similarly, and vary greatly at the transitional zone between loess and paleosol soil. Clay mineral contents and pore structure characteristics are two key factors affecting the SWCC, and they are nonlinearly corelated to the parameters of α and n.