Abstract: Low temperature CrN coating was prepared on 20CrMnTi carburized steel surface by arc ion plating. The effect of deposition temperature (120,150,180℃) on the microstructure and properties of the coating was studied. The results show that the prepared CrN coating was composed of Cr₂N phase and CrN phase. The thickness of the coating increased with deposition temperature, and the surface roughness first decreased and then increased. The coating prepared at 150℃ had the lowest surface roughness, and the coating surface had the best surface quality. With increasing deposition temperature, the residual compressive stress and hardness on surface of the coating increased first and then decreased, and reached the highest values at 150℃, which were 262 MPa and 754.29 HV, respectively. The coating prepared at 150℃ had the smallest friction coefficient of 0.251 7, and the main wear mechanism of the coating was abrasive wear and adhesive wear; the CrN coating prepared at 120℃ and 180℃ also underwent oxidation wear.