The objectives of the study are to investigate thermal conductivity(TC) and coefficient of thermal transmission(CTT) according to the type of soils, the presence of reinforcement, temperature, relative humidity and to analyze experimentally the characteristics of thermal transfer of reinforced soil wall. Results are summarized as follows : 1) Clayey soil has high value of TC and CTT than sandy soil. 2) TC and CTT of unreinforced soil wall is about 6~17% higher than those of reinforced one, 3) It is found that the effect of relative humidity on the soil wall is important at the same temperature and 4) As the temperature is high , it is appeared that TC and CTT are high.