Abstract: In order to make cermet hard coating have high hardness and good self-lubrication performance of "soft" coating,taking ternary cermet coating TiAlN as the object, the influence of different content of metal medium Cr doping on the microstructure and mechanical properties of the coating were studied, and the cermet composite metal phase structure coating w as prepared. The cathode arc plus glow discharge technology was used to prepare TiAlN composite Me-Cr coatings with different proportion on SUS304 stainless steel and single Si wafers by controlling Cr target current. The microstructure morphology of the coating was observed by SEM, the elemental composition of the coating was characterized by EDS, and the phase composition of the coating was analyzed by XRD. The two-dimensional profilometer and three-dimensional morphology i nstrument was used to characteristic the coating surface roughness and surface morphology of the coating. The Vickers hard ness tester was used to test the compound hardness of coating and matrix, the nano scratch instrument was used to study the friction coefficient of the coating. The results show that Me-Cr doping has a significant effect on the microstructure and mechanical properties of the coating. With the doping of Me-Cr, the pinholes and droplets on the surface of the coating increase, and the roughness of the coating decreases significantly, up to 31.2 nm. In terms of phase, Cr-Ti alloy phase is mainly produced in the coating. The hardness increases to a certain extent, up to 1035.2 HV. The friction coefficient is between 0.2 and 0.3.