The simulation of temperature control and crack prevention of large sluice under cold wave strike has low accuracy due to huge volume. To overcome this shortcoming, it is proposed a sub-master model correction algorithm. During the process of finite element calculation, the model was encrypted in space and time, and the results could be fed back to master model when the sub model finished the computations. The result of engineering example in Yucao Sluice showed that the influence on temperature of surface concrete is greater than internal concrete under cold wave of 5°C and 10°C, which leads to concrete crack; thus, taking appropriate measures can prevent crack. The result satisfied the need of construction and improved the speed of computations, which implies that the algorithm is reasonable.