The working principle of dynamic and static pressure hybrid bearings is a hybrid superposition of the working principles of dynamic pressure bearings and static pressure bearings. It applies the hole-type torus secondary throttling principle. It adopts a shallow cavity structure with hole-type oil supply and stepped oil-sealing edges of unequal width. The static pressure carrying capacity of the bearing is improved. After the oil supply integrated hydraulic pump is started. The oil supply pressure can reach 98~147N/cm2 (approximately 1~1.5MPa). Hydrostatic oil can levitate the spindle in the front and rear bearings. After the spindle rotates, the pressure in the oil chamber pressure gauge can reach 196~245N/cm2 (approximately 2~2.5MPa). The load-bearing capacity and stiffness are increased by more than four times compared to before the main shaft rotates. At this time, the single-sided gap between the grinding head spindle and the bearing is 0.01~0.04mm. Due to a high-pressure oil film support. Make the spindle work in a suspended state. It not only uses the principle of static pressure to overcome the problem of contact wear between the main shaft and the bearing bush of the dynamic pressure bearing. It also uses the dynamic pressure principle to overcome the problems of spindle drift and insufficient oil film rigidity of the static pressure bearing.