The dynamic and hydrostatic gas bearing with herringbone groove and axial micro through groove was designed,and the static characteristics were simulated and analyzed by FLUENT.The effects on the bearing stiffness and bearing capacity were studied by changing the parameters such as axial micro through groove depth,eccentricity,film thickness and air supply pressure.The results show that when other conditions remain unchanged,the greater the eccentricity,the smaller the bearing stiffness and the greater the bearing capacity.Herringbone grooves can enhance the bearing capacity and stiffness of gas bearing,the faster the spindle speed,the stronger the dynamic pressure effect,and the greater the bearing stiffness and bearing capacity.As the axial micro groove depth increases,the bearing stiffness first increases and then remains stable,and the bearing capacity first increases and then decreases.Therefore,when the axial micro groove depth is too large,the bearing stiffness changes little,but the bearing capacity will decrease.