For the first time without circumferential oil groove back four cavity radial hydrostatic bearing for Progressive Mengen( PM) flow controller,the mathematical model for hydrostatic bearings is established and the effect of the bearing structure parameters on the static characteristics of aerostatic bearing is analyzed. The results show that the smaller the axial flow oil seal edge coefficient is,the bigger the circumfluence oil seal edge coefficient,the larger the bearing oil film stiffness and bearing capa...