Abstract: Starting from an actual high-rise building project, the temperature field formed by the hydration heat in a 28-day concrete curing period after concrete placing was discussed, as well as the calculation relevant to it. The FEA software ANSYS was used for the thermal analysis of the temperature field formed by the bulky concrete of the raft foundation required for high-rise buildings. The temperature distribution of the raft foundation in the 28-day concrete curing period was calculated preliminarily through numerical simulation. Then, the temperature field calculated for prediction was given to evaluate the trend of temperature-induced cracking, by which a temperature-fall technology in foundation construction can be formulated reasonably.