1. positioning accuracy linear guide as a linear guide, linear guide way due to friction rolling friction, not only sliding friction coefficient down to 1/50 of the guide, dynamic friction and static friction gap also become small. So when the bed running time, there will be no slip phenomenon can reach μm-level positioning accuracy. 2. Wear less able to maintain a long tradition of precision slide guide, inevitably due to the adverse effect of greasy countercurrent kinematics accuracy, and because of inadequate lubrication during exercise, leading to wear the orbit of the contact surface, significantly affect the accuracy. The rolling guide wear is very small, so the machine can maintain precision long time. 3. For high-speed motion and significantly reduce friction due to linear guide movement is very small, only a small force will make the bed running, especially running back and forth to the regular work of the BED drive the required horsepower machine , more significantly reduce the amount of power consumption machine. And the heat generated by friction because of its small, suitable for high-speed operation. 4. can withstand loads up and down direction