A new structure for fhree-shaft aerostatic precise guide is proposed in this article. Making use of its central symmetry, it has not only the same stiffness at horizontality or perpendicularity,but also the same stiffness and dynamic damping character at any direction of the whole circle. It can satisfy the requirement of a precise guide.Meanwhile, it has several advantages: no oil-pollution, no stick-slip motion due to less friction of aerostatic lubrication bearing and so on. These advantages are due to this device that can resume primary posrtion throughout from the disturbing of exterior forces and the moment of exterior forces.