In order to increase the service life for piston rings, the (Cr ,Ti) N composite coatings have been successfully synthesized on 65Mn steel substrates by using arc ion plating technology. The influences of Ti content on the deposition velocity, phase structure , surface morphology and hardness of the composite films were investigated. The results showed that the surface roughness will reduce after addition of Ti element. And the hardness, residual stress of CrN films will increase after addition of Ti element. The preferential growth orientation of the composite film changes from CrN (111) to CrN (220). With increasing Ti content, the phase structure of CrTiN films will change from CrN type to TiN type. When the Ti atomic number was 0.62, the hardness of CrTiN composite films reaches the maximum, about 35GPa. Wear test indicate that the fiction of CrTiN films are lower and the wear volume are less than CrN films. The CrTiN composite films performs better than binary CrN films in teams of hardness and wear resistance at high temperature.