In this paper, we reported the oxidation behaviour of Ti2AlN coatings on a -TiAl substrate. The coatings composed mainly of Ti2AlN MAX phase were obtained by magnetron sputtering and subsequent vacuum annealing. Isothermal oxidation tests at 700-900 °C were performed in air. The results indicated that the oxidation resistance of the -TiAl alloy can be improved by depositing a Ti2AlN layer on the alloy surface, especially at high temperatures. An Al-rich oxide scale formed on the coating surfaces during oxidation. This scale acts as diffusion barrier blocking the ingress of oxidation, and effectively protects the coated alloys from further oxidation attack.