Abstract：The research of high-level radioactive waste disposal is very necessary and important；and the determination of high-level radioactive waste disposal scheme is of importance for high-level radioactive waste repository safety. The high-level radioactive waste disposal structure is based on the physico-mechanical properties of rock mass and expansive soil. Based on the high-level radioactive waste disposal types，the relative research projects are proposed；and the THM coupling theories are introduced. The soil-water characteristics curve of bentonite depends on not only external loaded force，vapor pressure and hydraulic pressure，but also on the temperature in the high-level radioactive waste disposal. The conservation equation of water quantity in the gas and liquid states is established by considering the propagation of gas under pressure gradient，the solution of gas in the water，the condensation of gas in the water，etc.. The energy conservation equation is obtained by considering the influences of sensitive thermal flow and potential thermal flow. The schemes of finite element and finite difference are deduced. Finally，the one-dimensional code and calculation are performed. The numerical result is valuable for the determination of chamber distance of high-level radioactive waste disposal shaft.
