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In order to improve the surface properties and prolong the service life of die steel, TiAlCrN film was prepared on the surface of H13 die steel by multi - arc ion plating technology. The effects of nitrogen - argon flow ratio on the surface morphology, phase structure, hardness, adhesion, and high temperature oxidation resistance of TiAlCrN film were investigated through scanning electron microscope (SEM) and X - ray diffraction (XRD). Results showed that with the increase of nitrogen argon ratio, the number of large particles on the surface of TiAlCrN film increased first and then decreased, and the hardness, adhesion and high temperature oxidation resistance also increased first and then decreased. When the nitrogen - argon ratio was 8∶2, the as - prepared TiAlCrN film had the optimal properties, such as the maximum hardness of 2700 HV0.5 N, the maximum film - substrate adhesion of 26 N, and the optimal high - temperature oxidation resistance.