Vanadium titano-magnetiteMagnetite has become an increasingly important iron ore resource in the world. While the strength and reducibility of iron sinterSinter for blast furnace ironmaking became worse when the vanadium titano-magnetiteMagnetite was introduced. In this study, the formation behaviorFormation behavior of calcium ferrite containing TiO2TiO2 in sinteringSintering of iron ore fines was investigated through the reaction experiments and TG-DSC methods. Based on the experiment results, it was found when the TiO2TiO2 was introduced into CaO-Fe2O3 system, a calcium ferrite containing TiO2TiO2 was formed, where the chemical composition and melting pointMelting point of this calcium ferrite could be confirmed as Ca3TiFe2O8 and 1353 ℃. Furthermore, the formation mechanism of Ca3TiFe2O8 was realized, where the CaO was firstly reacted with TiO2TiO2 or Fe2O3 to form CaTiO3 and Ca2Fe2O5, and then the CaTiO3 and Ca2Fe2O5 reacted to form Ca3TiFe2O8. The results were beneficial for promotion the liquid phase formationPhase formation in iron sinterSinter containing TiO2TiO2.