Abstract: In the present work, the TiN plating technology for the two kinds of materials of 4Cr14Ni14W2Mo and W9Mo3Cr4V was studied with a MIP-700 multifunction ion plating machine, and the binding force of the film was measured with a WS-2005 automatic scratch measuring instrument. In addition, the judgment criterion for the binding force and the definition standard of "critical load" in the world were analyzed. The normal load obtained when the film began to crack and peel off and the friction factor suddenly increased was defined as the "critical load" and considered as the judgment criterion of the film binding force. Based on the above results, the experiment methods and critical load judgment criterion for the binding force of the film plated on 4Cr14Ni14W2Mo and W9Mo3Cr4V by vacuum arc deposition were worked out.