In order to ensure the long life of the bearing and cannot meet the general installation and adjustment requirements, the following measures should be taken: (1) The bearings are grouped according to the size of their interference fit surfaces, and the bearings in each group are grouped according to their clearance. Arranged by size. The corresponding shaft or housing diameters are equally grouped. Match the bearing set with large interference fit surface size to the shaft set or seat hole set with large diameter, and select the corresponding set with small size and small diameter. In each corresponding group of matching, the bearing with large clearance shall be used for a tighter fit, and the bearing with small clearance shall be used for a looser fit. As a result of this selection, in the same batch of machines, the interference of the bearings is relatively consistent, neither too loose nor too tight, and the clearance is relatively uniform, so as to ensure the proper prestress after the bearing is installed, and avoid The occurrence of abnormal bearing failures such as creeping, ring bursting, shock, vibration or heat generation due to improper clearance, and cohesion. (2) The coaxiality of the journal and seat hole at both ends of the support and the perpendicularity to the end face of the support should be strictly guaranteed to prevent the generation of additional loads. If possible, the mechanical components should be slightly away from the more vulnerable end of the bearing for loads other than the bearing, and the shaft and rotating parts system should run as smoothly as possible.