Abstract: Thermal effect leads to changes of density,elastic modulus and so on of porous medium,which affects the propagation characteristics of acoustic wave.In this paper a heat transfer equation of water-saturated porous medium is presented on the basis of energy conservation theory of deformable bodies,with considering the thermo-mechanical coupling and interphase thermal coupling.Thus,a thermo-mechanical coupling wave propagation model is set up based on analysis of thermal-effected strain and stress of water-saturated porous medium,with the consideration of three couplings between the porous water and porous solid phase.An experiment is carried out to measure compressional speeds of sediment samples under the control of temperature,which gets the increase of 88m·s^-1 in ultrasonic velocity with temperature varied from 2℃ to 27℃.The experimental results are well explained by the set-up model and relative errors in comparison with the theoretical calculations are from negative 3.03 percent to 1.19 percent.