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In steelmaking process, to produce ultralow-sulfur steel, hot metal pretreatment has become the key technology to remove sulfur element from molten iron.1,2) Currently, the hot metal pretreatment can be divided into mechanical stirring approach and gas injection approach, depending on how the molten pool is stirred.3,4) The gas injection approach is widely used in steel plants due to its advantages of deep desulfurization and good kinetic conditions. In this approach, Mg-based desulphurization agent is injected into molten iron through a submerged lance and reacts with sulfur element.5) The mechanism and behavior of desulfurization have been studied by many researchers,6–9) and their results show that the efficiency of desulfurization reaction is related to mixing behaviors of molten iron. In addition, the homogeneity of chemical compositions and temperature of molten iron is also related to mixing phenomena. For hot metal pretreatment process with fixed operation parameters, optimizing submerged lance structure is the most effective way to improve mixing behaviors. Therefore, considerable Optimization of the Structure and Injection Position of Top Submerged Lance in Hot Metal Ladle