Abstract:There is an initial wetting strain between dry state and wet state of soil sample,even no pressure exerts on the sample. Most soils in nature undergo the partial wetting process;and the saturated wetting process carries out from unsaturated state to saturated state. Therefore,it is necessary to calculate the initial wetting strain and partial wetting process. A new practical method interpreted takes unsaturated seepage into consideration,and takes the initial deformation and soil parameters as the function of wet degree to solve partial wetting process. This method is put forward on the basis of the original method,which can only solve the dry state and wet state deformation. In this paper,the theory about the method is introduced;and corresponding software is developed. This method can solve the influences of stress path and wetting path well in the case of high fill engineering. The wetting process of highly compacted soil in Wushan Municipal Sewage Treatment Plant is simulated by this method. Results gained from numerical simulation have a good agreement with those from oedometer test. It proves the validity of the new method.