Based on the analysis of the current research on and practical operation technology of direct alloying of manganese ore in BOF at home and abroad, an analysis has been made of the effects of such main process parameters as converter slag volume, (FeO), end-point [C] content and slag basicity on the yield of direct alloyed manganese ore from manganese ore in BOF, thus forming the key technology idea of increasing the yield of manganese from manganese ore in BOF. In view of the current research of BOF smelting in China, some corresponding countermeasures have been put forward, i.e, direct alloying with manganese ore by self-reducing compaction instead of adding manganese ore directly.