Abstract: A 3-D zone method mathematic model of reheating furnace was established based on energy balance to calculate the radiative heat transfer in a reheating furnace. The computational method of a dynamic mathematic model was given based on the steady-state model and applied in reheating furnace for rolling delay process analysis. The simulation results showed that the influence of rolling delay on the heat transfer process last for a long time. The flexible heating strategy should be adopted once the delay occurs. Specifically, fuel supply should be relatively substantially reduced and keep in a period of time after delay for the short time delay. For long delay, fuel supply should start to be reduced in an appropriate moment before delay, and began to gradually restore to the original quantity after delay.