In order to design the reduction furnace reasonably, the heat convection coefficient between the cooling water and the water pipe in the cooling module, and the comprehensive heat transfer coefficient of the exterior furnace shell were calculated using engineering heat transfer analysis. Based on the workflow of a reduction furnace, three work conditions were defined. Using finite element software ANSYS, the furnace shell temperature field and the thermalstructure coupled stress field in high temperature working conditions were calculated using a thermalstructure coupled method. The result indicates that the maximum Von mises stress of each region of the furnace shell is significantly less than the yield limit of the material under the workload. The static strength of the furnace shell satisfies the practical requirements. The GoodmanSmith fatigue limit figure was used to evaluate each node. It was found that the fatigue strength also meets the corresponding requirements.