Abstract: On the basis of simulating calculation with heat transfer model, and employing the principle of transition in electric circuit,a automatic control model of secondary, cooling in continuous casting is developed in this paper. The feedforward control pattern is applied, and the change curve of the water flowrate during the transitive proce adopts the exponentia form.This model has the advantages of simplicity and better precision. Moreover it has a characteristic of restraining the fluctuation of surface temperature quickly owing to not using any feedbaek informations from the system.Through offline simulation it is proved that the control effect of this dynamic control model is evidently superior to that of any static control.