Abstract: The thermodynamics calculation and analysis for oxidation-reduction roasting of titanium slag produced by electric furnace in Panzhihua were carried out in this paper,based on which the phase com-positions of the oxidized products at different roasting temperatures for the titanium slag were determined by X-ray diffraction.The results indicate that rutile and M₃O₅ solid solution are formed by the oxidation of titanium and iron with lower valence in the calcination process. The reduction thermodynamics analysis shows that the trivalent iron transforms into divalent iron compounds by reduction of the oxidation calcina-tion products for the titanium slag.