Abstract: TiC/Ti6Al4V composites were fabricated by microwave sintering. The isothermal oxidation behaviors of the TiC/Ti6Al4V composites were investigated in air under the temperature of 550, 650 and 750℃. Moreover, the surface and cross-sectional morphologies and phase composition of the oxidation film were investigated. The results show that the TiC/Ti6Al4V composites are composed of TiC, α-Ti+β-Ti phases. With increase of the oxidation temperature, the oxidation rule curves change from parabola into line. The oxidation products of the composites mainly consist of TiO₂ as the oxidation temperature lower than 650℃. While the oxidation temperature is high up to 750℃, the oxidation coatings are composed of three layers, containing thin outer TiO₂, intermediate Al₂O₃ and TiO₂ and inner TiO₂. With the TiC content increases, the oxygen activation energy increases, the particle size of oxide decreases and the oxidation resistance of TiC/Ti6Al4V composites improves.