Abstract: The momentum equilibrium equation,the continuity equation for water,the energy balance equation and the elastoplastic matrix for analysis of coupled thermo-hydro-mechanical phenomena in saturated-unsaturated porous media were established,and the numerical simulation for the coupled thermo-hydro-mechanical processes of near field in a conceptual nuclear waste repository was made,and the variations of temperature,saturation,pore pressures and normal stresses in horizontal direction with time at several points of buffer and rockmass were investigated.The obtained results were compared with the calculated datum of foreign similar codes,and it was shown that the regulations of both results had certain identity qualitatively,but there existed some differences among them quantitatively.The author also tried to analyze the reasons and got some realization.