Bearing requirements are generally the most important bearing life. Bearing performance requirements are different for different environments. The quality of China's bearings is different from that of Japan, Germany, and Sweden. It is mainly reflected in: the heat treatment process of materials, the processing precision of bearings (the precision control of machine tools), in fact, the Chinese machinery and materials industry started late, and now the level is behind These countries. Nowadays, China's bearings are gradually rising in quality and gradually occupy a certain share of the domestic and international markets.