The soil water characteristic curve describes the nonlinear relationship between soil water content and suction, which provides a basis for the study of soil-water interaction of unsaturated soil. The parameters of unsaturated soil can be obtained by measurement directly, this method, however, is usually costly and time-consuming. The soil water characteristic curve can be used to predict the mechanical properties of unsaturated soil, such as permeability coefficient and shear strength. Therefore, it is of great significance to obtain the soil water characteristic curve for the study of unsaturated soil properties. This paper summarizes the research of soil water characteristic curve fitting and its influencing factors. According to the different research perspectives, the content is divided into two parts: the fitting and the experimental acquisition of soil water characteristic curve. By combing the research results of the two parts, it is considered that the future research focus on soil water characteristic curve are: (1) obtain the appropriate pore size distribution function; (2) optimize the empirical model of soil water characteristic curve, so that the model can be more extensive; (3) Improving the accuracy of the database and how to better extract the characteristics of the test data is the key study of the soil-water characteristic curve prediction; (4) develop the study on soil-water interact under the coupled thermo-chemical-hydro- mechanical field.

来源平台：ENGINEERING GEOLOGY FOR A HABITABLE EARTH, VOL 3, IAEG XIV CONGRESS 2023