In developed countries, the rise in high standard living standards and disposable income gives consumers the ability to buy machinery, which enables all after -sales market products to be used for machinery. In addition, during the forecast period, the growth of the mechanical market is expected to promote the growth of the bearing market of the mechanical engine. The development of technology and research and development creates more strong materials, which can withstand greater gravity, which is also expected to promote the growth of the mechanical engine bearing market. The replacement rate of mechanical engine bearing is very high, so the mechanical after -sales market occupies an important share in the mechanical engine bearings market.