Abstract: The melting point of titanium-containing steel slag was theoretically calculated using the Phase Diagram module and the Equilib module of thermodynamic calculation software FactSage,and the calculation result was verified by melting experiments.It is shown that,for a slag system with the basicity below 1.5,when the mass fraction of TiO₂ is less than 13%,TiO₂ has little effect on the melting point of the slag,and while the mass fraction of TiO₂ is over 13%,TiO₂ can increase the melting point.For a slag system whose basicity is over 1.5 and mass fraction of Al₂O₃ is between 25% and 35%,when the mass fraction of TiO₂ is more than 1%,TiO₂ can significantly increase the melting point of the slag.