Abstract: Based on the Biot's wave theory, a thermal elastic wave equation for saturated porous media is established, and reflection of SV waves at the interface of the plane is analyzed. According to the boundary conditions, theoretical expressions for four kinds of reflection waves on the free boundaries are derived, including p₁ waves, p₂ waves, T-wave and S-wave. The numerical results are obtained and used to discuss the relationship of reflection amplitude for four kinds of reflection waves under frequency and drainage conditions. It is indicated that there is apparent low frequency amplification for p₁ waves, and it is obvious in impermeable case. The reflection rate of p₂ waves is little and increases with the increase of the frequency. There is less reflectivity of T-wave.