Abstract: After the magnesium-carbon bricks were used as BOF lining, the temperature of BOF shell went up greatly, and led the BOF shell to creep. By means of Hi-Vap cooling technology, the temperature of BOF shell could be controlled. Based on the FEM, and making use of ANSYS software package, the temperature field of BOF shell was analyzed under complicated working state for a large complicated structure and complex heat transfer status and Hi-Vap cooling etc. The cooling parameters were rationally fixed on, such as cooling time and water flow etc. These achieved the purpose of restraining creeping and provide a base for the cooling system design as well as the maintaining technology of BOF body.