Rotating table is an important part of CNC machine tools,and its operation accuracy directly affects the shape error and surface roughness of the workpiece.Starting from the design of the support bearing of the rotary table of the precision CNC milling and grinding machine,the static pressure bearing support form was selected and the bearing was designed and tested.The radial bearing and thrust bearing were designed with 4 oil chambers and 8 oil chambers with oil return groove structure respectively,and small hole throttle was selected for the throttling method.The changes of bearing oil film stiffness with radius clearance and throttle aperture were calculated,and the sizes of radius clearance and throttle aperture were determined according to the calculation results.The rotation accuracy of the designed bearing was tested on a simulation test device.The test indicators were radial runout and axial channeling.The test results show that the maximum radial runout is 0.15 μm and the axial channeling is 0.1 μm.The designed bearing meets requirements for the use of precision turntables.