Aiming at the processing difficulties of laser cladding remanufacturing layer of large centrifugal pipeline compressor blade, cladding damping alloy formula and repaired layer milling process theory are investigated. The laser cladding repaired layers are prepared by FeCr alloy and Cu mixed powder on KMN steel substrate. The microstructure, phase constitution, hardness and wear resistance of the repaired layer are investigated by scanning electron microscope, X-ray diffractometer, energy dispersive spectrometer, Vickers digital micro-hardness tester, sliding wear tester and optical profiler. Vibration signal is collected during side milling process of repaired layer. The impact of Cu on machining vibration and surface roughness is investigated. The results show that, the grain size decreases dramatically and the microstructure of repaired layer is refined with the Cu content increasing. The hardness and wear resistance of coatings with Cu are improved significantly. Machining vibrations of repaired layer with Cu are obviously reduced, and the chatter is effectively avoided occurring.