Abstract: This paper studies the problems of erosion by slag at the rim of the steel pot and cracks in the permanent layer, and optimizes the structure of the rim and the permanent layer refractory materials by adopting the double-ring construction method to solve the problems of erosion by the mortar at the pot mouth and cracks in the permanent layer. By optimizing the structure of the permanent layer, the thickness of the working layer, and the structure of the refractory materials at the pot mouth, the safety of the steel pot is improved and the volume of the steel pot is increased. The results show that by using magnesium carbon brick with anti-slag erosion properties, the problem of erosion by the mortar at the pot mouth can be effectively solved and the average holding capacity of the steel pot can be improved. The application of the inner ring brick and the simultaneous construction of the pouring mortar in the permanent layer, while meeting the needs, significantly improves the safety performance of the steel pot.