In order to improve the surface quality of machined parts,combining with aerostatic bearings;a novel air bearing spindle system was designed to meet the requirement for precision turning.A general design model of the system structure was established.The overall of spindle system uses aerostatic supporting structure combined with cylindrical radial and plane thrust bearing.The eccentricity value of the structure was determined by gauge ratio method,and the rationality of this value was verified by the FLUENT software.The finite element model of spindle rotor was established and simulated in ANSYS Workbench to verify the design speed.The result shows that the designed spindle speed can effectively avoid the resonance area, to ensure stable operation of the spindle and reduce the processing error of parts. 