In order to improve the antifatigue property of the carbon coating,the N doping was used to modify the carbon coating.N doped CrC coating and CrC coating were prepared on the contact surface of the rolling bearing parts by the magnetron sputtering technique.The performances of the two kinds of coated bearings,such as speed,vibration,temperature rise and reliability life,were tested and analyzed.The results show that,the highspeed performance and vibration performance of the N doped CrC coated bearing are not as good as the CrC coating bearing.But the N doped CrC coating improves the fatigue resistance and reliability life of the rolling bearing.Compared with CrC coating,N doped CrC coating is not suitable for the operating conditions of rolling bearings,such as high speed and heavy load.