Abstract: Based on the heat transfer theory, the plane differential equation and initial boundary conditions of the temperature field of pile foundation in the cold region are presented. Taking the test pile engineering for example, the numerical model of plane was established. The results solved by the numerical model method and the measured values were shown to be in good agreement. The action of hydration heat of concrete to the frozen soil, and the dissipation law of the heat effect were studied, and the influence of molding temperature and total hydration heat on the process of the refrozen were discussed. The conclusions are as follows: the influence of hydration heat of concrete on ground temperature is a long-term, and weakens with the increasing of the refrozen time. Molding temperature and total hydration heat of the concrete influence the process of the refrozen, and the former has more influence than the latter.