The lubricating methods of the bearing are divided into grease lubrication and oil lubrication. In order to make the bearing play well in function, it’s first to choose the lubrication method with the appropriate using conditions and purposes. Considering that lubrication only, oil lubricity is dominant. However, comparing the advantages and disadvantages of grease lubrication and oil lubrication, grease lubrication can simplify the around structure of the bearing. Lubrication should pay specially attention to the amount. Whether it is oil lubrication or grease lubrication. If little amount, lubrication is not adequate, affecting the bearing life; If much amount, it will produce too much resistance, affecting the speed.