Slewing support is widely used in real industry. It is called "the joint of machine". It is an important transmission element for the machinery that needs relative rotation motion between two objects and bears axial force, radial force and overturning moment at the same time. With the rapid development of machinery industry, slewing bearings have been widely used in marine equipment, construction machinery, light industry machinery, metallurgical machinery, medical machinery, industrial robots, tunnel boring machines, rotary stage lights. Next, we briefly introduce the four point contact ball bearing and light slewing bearing, and briefly analyze the difference between them, hoping to help you better understand the four point contact ball bearing and light slewing bearing.