In this work, an experimental study in heat and mass transfer in unsaturated soil was conducted. The influences of the different factors such as air temperature, air velocity and heat radiation on the migration processes of heat, moisture and salt were investigated. The dynamic distribution of temperature, moisture content and salt content in unsaturated soil under simulated climatic conditions was obtained. It is found that unsaturated soil can be divided into three regions as absorbing, transiting and releasing in moisture migrating process. The positions of different regions, the depth of heat infiltration and the equilibrium time for heat and mass transfer processes were determined. The results could be used to examine and correct the theoretical models of heat and mass transfer in soil.