Chromium coatings were deposited on γ-TiAl alloy by multi-arc ion plating (MAIP). The high temperature oxidation resistance of the coatings was tested by SEM, EDX and XRD. The results show that the coating at high temperature can form a protective oxide film. The oxide film is mainly divided into two layers. The outer part at 650 oC is Cr2O3, at 750 oC is TiO2 and at 950 oC is Al2O3. The inner oxide film is Ti-Al-Cr mixed oxide film. The Ti-Al-Cr diffusion layer can effectively prevent the diffusion of oxygen into the substrate, and thus significantly improve the γ-TiAl high-temperature oxidation resistance ability