Aimed at the problem of insufficient precision of the rotary motion of the hydrostatic turntable,the fan-shaped hydrostatic turntable of CNC grinder was taken as the object,the displacement rate and design clearance of the single hydrostatic bearing structure were theoretically calculated,and the relationship between the oil film bearing capacity and the displacement rate & design clearance was obtained.The internal flow field of oil chamber was simulated and the influence law of different oil chamber structures on the bearing performance of oil chamber flow field was obtained.According to the simulation results and the parameters of the turntable,a appropriate oil chamber structure was selected and a fan-shaped hydrostatic turntable was designed.The rationality of the oil chamber design was verified through the fluid-solid coupling analysis.The feasibility of the oil chamber design was verified through the stiffness test of oil film.