Abstract:The system of partial differential equations governing the coupled processes of heat conduction and moisture transfer in unsaturated soils is presented. A transient state distribution of temperature within the infinite medium is assumed to induce the moisture transfer process. For this,the solutions in transform space are given by repeated Fourier transformations and Laplace transformation. An analytical method for calculating the unsteady temperature field and volumetric moisture content field due to instantaneous point heat source is deduced by using a so-called heat source function method. With integration in temporal and spatial domains,a calculation method of heat-induced moisture movement in the vicinity of a spherical heat source with variable intensity with time is established. The moisture transfer characteristics with time and moisture distribution within the porous medium are illustrated.