According to the characteristics of tribology in rolling bearing,the wear of the cages with copper,iron or nylon as main materials was studied with XRF analysis technology,the correlation between cage wear and bearing roller wear and the influence of cage wear on the bearing wear failure process were analyzed.The influence of wear particles produced by the cages of different materials on bearings and grease was analyzed and discussed.The results of statistical data analysis show that there is a certain degree wear of the cages with different structures or materials during the operation of grease lubricated bearings and the wear amount of cages is significantly related to the wear amount of the bearing roller.The effect of wear particles formed by polymer nylon cage on the bearing is main the mechanical action of hard abrasive fillers from materials of polymer cage,while the wear particles of iron cage have metal activity and catalysis,which can accelerate the chemical oxidation process of grease and destroy the network structure of grease thickener.