<p>The local structure and transport properties of molten titanium slag have critical effects on the efficiency of reduction reaction and the effect of slag-iron separation. The effect of Ti₂O₃ content on the local structure and transport properties of TiO₂–Ti₂O₃–FeO System was studied by molecular dynamics simulations. The average bond lengths of Ti⁴⁺–O²⁻, Ti³⁺–O²⁻and Fe²⁺–O²⁻ are 1.92, 2.07 and 2.04 Å, respectively. Ti⁴⁺ and Ti³⁺ ions are inclined to form [TiO₆]⁸⁻ and [TiO₆]⁹⁻ octahedra. [TiO₆]⁸⁻ and [TiO₆]⁹⁻ octahedra have two different connection modes: corner-sharing connection and edge-sharing connection. A small part of edge-sharing connections is transformed into corner-sharing connection for both [TiO₆]⁸⁻ and [TiO₆]⁹⁻, reducing the overall structure strength of the system. For both [TiO₆]⁸⁻ and [TiO₆]⁹⁻, the edge-sharing octahedral configuration is found to possess higher stability than the corner-sharing octahedral configuration. The diffusion coefficient decreases in the sequence: Fe²⁺ &gt; Ti³⁺ &gt; O²⁻ &gt; Ti⁴⁺. When the Ti₂O₃ content increases from 10 to 43 pct, tricluster oxygen and bridge oxygen gradually transform into free oxygen and non-bridge oxygen, reducing structure strength of the system, and the viscosity of the system decreases from 0.103 to 0.044 Pa·s. Raising Ti₂O₃ content depolymerizes the system, thereby reducing its viscosity. This study provides a viable pathway toward the efficient production of high-quality titanium slag.</p>