Wear is an inevitable phenomenon during the use of bearings. Wear not only affects the performance and service life of bearings, but may also cause failures in mechanical equipment. Therefore, understanding the types and causes of wear is crucial to extending the service life of bearings. Generally speaking, bearing wear is mainly divided into three types: abrasive wear, adhesive wear and fatigue wear. Abrasive wear usually occurs when there are hard particles or foreign matter on the bearing surface, which scratch the surface during movement; adhesive wear is caused by the adhesion between metal surfaces under extreme conditions such as high temperature and high pressure, resulting in material peeling and surface damage; fatigue wear is caused by repeated loads and movements, which eventually leads to the formation of fatigue cracks in the bearing material. Therefore, in order to reduce wear, the bearings must be lubricated and cleaned regularly, and the working environment must be kept clean. In addition, reasonable material selection and design, appropriate installation and commissioning, and regular maintenance are all important measures to reduce wear and extend the service life of bearings. Through in-depth research and analysis of wear phenomena, engineers can better optimize the design and use of bearings, thereby improving the efficiency and reliability of the entire mechanical system.