In view of the problems of relatively small bearing capacity and low controllability of the aerostatic precision spindle supported by aerostatic bearing,a hybrid aerostatic support spindle was designed by combining the aerostatic bearing with circumferential microchannel groove and the active magnetic bearing based on incremental PID control.In order to improve the bearing capacity of the smallhole throttling static pressure bearing,the plenum chamber on the inner surface of the hydrostatic bearing was connected by a rectangular,triangular and semicircular crosssection dynamic pressure microchannel groove.The influence of the dynamic pressure microchannel groove on the bearing capacity of the bearing was analyzed by FLUENT simulation.Based on the rotation accuracy of the spindle,the performance of the active magnetic bearing controlled by the incremental PID was simulated in Matlab Simulink.The results show that the three kinds of dynamic pressure microchannels can effectively improve the bearing capacity of the hydrostatic bearing.The rectangular section has the best improving effect on the bearing capacity under the same conditions,which can increase the bearing capacity by 54%.The active magnetic bearing based on incremental PID control can effectively improve the steadystate response speed and rotation accuracy of the spindle,so that it can maintain the rotation precision of 0.2 μm after starting for 40 s.