Abstract: The properties of friction and wear of 20CrMnTi steel treated by carbonitriding and magnetizing electrolytic sulfurizing were studied. Using scanning electron microscopy, electron probe and X-ray diffraction, the surface morphology and micro-hardness of the samples being worn for different times were analyzed, and were compared with those of the samples treated by carbonitriding, and combined treatment of carbonitriding and low-temperature electrolytic sulphurizing. Results show that the friction coefficient, wear loss and wear rate of the samples treated by carbonitriding and magnetizing electrolytic sulphurizing have the smallest value, followed by the samples treated by carbonitriding and low-temperature electrolytic sulphurizing, then the carbonitrided samples. The wear loss of the samples treated by carbonitriding and magnetizing electrolytic sulphurizing reduces by 50%, and the friction coefficient is 1/3-1/5, compared to the carbonitrided samples, showing excellent wear resistance and friction-reduction behavior. And its micro-hardness has no change before and after wear process. The wear mechanism is similar for the test steel treated by three processes, which changes from pitting flake for a short period of time to long deep spalling, and belongs to surface fatigue wear mixed with some adhesive wear.