The sliding bearing is sliding friction, and its structure is simple, the volume is small, the contact surface is large, the bearing capacity is strong, the anti-vibration performance is good, but the friction coefficient is large, so it is suitable for low-speed heavy load. Rolling bearings are rolling friction. Compared with the sliding bearing, the contact surface is small (the ball bearing is point contact, the roller bearing is line contact), it is easy to be heated, it needs complete lubrication, the friction coefficient is small, the wear is small, the heat is small, the precision is good, suitable High speed operation. However, the bearing capacity is poor and the vibration resistance is poor.