| The simulated equations of soil moisture characteristic curve and saturated hydraulic conductivity are widely used in the prediction of the hydraulic conductivity and water diffusivity of unsaturated soils.Taking Heilu soil as an exemple, this article analyses and compares the difference and accuracy of soil hydraulic parameters simulated by four models including Broadbrige-White model, Van Genuchten model, Burdine model and Mualem model. The results shows that the accuracy of the simulated values of the four models compared with the observed values is high when soil water content is at a high level. The simulation accuracy of water diffusivity is higher than that of hydraulic conductivity in unsaturated soil. As to Heilu soil, the accuracy of soil hydraulic parameters simulated by Broadbrige-White model is the highest among the four models. |