Abstract: This paper explores the issue of establishing the regression relationship between soil characteristic parameters and the model of SWCC from the angle of basic physical soil properties.Firstly it discusses the soil factors which could influence SWCC,and the application of SWCC in engineering.Then it introduces the function of SWCC based on pore-size distribution curve by Fredlund and Xing.It also presents the conception and physical meaning of the equivalent capillary head.By fitting the existed experimental data with the equation of Fredlund and Xing,the fitted parameters in the model can be obtained.Then it establishes three different regression relationships,with 2,3 and 4 independent variables respectively,for granular and plastic-cohesive materials.The calculated parameters are compared with the experimental fitted parameters.The analysis of the results of various regressions method is given,and the best regression functions are recommended.The predictions of the method could well capture the tendency of SWCC.