Aeroengine engine spindle cylindrical roller bearings often fails due to poor working conditions.The failure analysis of the cylindrical roller bearing after service was carried out by using optical microscope,scanning electron microscope,energy spectrometer,Raman spectroscopy,X-ray photoelectron spectroscopy.The results show that according to the failure mechanism and the micromorphology,the failure modes of cylindrical roller bearings can be divided into eight different failure modes,including lacerations and abrasions,slippage,crater pi,fatigue spalling,vibration pattern,thermal discoloration,inner ring burn,cage silver plating wear.The bearings with the failure modes of slippage,inner ring burn and cage silver plating wear were analyzed.The results show that the O element is found on the bearing surface with slippage failure,indicating that oxidative wear occurs during the process of slip and bruise.The oxides of Fe,FeO and Fe2O3are found on the surface of burned bearing,indicating that the bearing has a higher temperature during burns,the lubricating oil film is damaged,and the roller and inner ring are in contact with each other to cause severe wear.The silver layer on the surface of the cage falls off,and some of the wear area exposes the copper surface,indicating that friction and wear of the cage occurs during service.