As the four phase of the soil,frozen soil has very complicated physical properties and a high sensitivity to temperature. Cyclical temperature changes will make permafrost subgrade cause diseases, such as frost heaving and thawing settlement. Therefore, the construction of railway and highway in permafrost soil zone has been a worldwide problem. In order to prevent the thawing of permafrost and to maintain the stability of the permafrost, heat pipe subgrade is widely used in the construction of Qinghai Tibet Railway. As is well known to us, heat pipe can only work in the warm season rather than the cold season. Based on the working principle of the heat pipe and the principle of semiconductor refrigeration, we install artificial refrigeration device on the condensing section of the heat pipe to make its temperature lower than the temperature of the evaporating section, so as to drive heat pipe work and achieve the purpose of decreasing the ground temperature. Tests carried out in the Fenghuo Mountain show that the new semiconductor thermal pipe can significantly reduce the temperature of the active layer and is expected to play a good effect in the construction of railway and highway projects in the permafrost regions.