The finite element model for the gas film of spherical spiral groove hybrid gas bearings was established based on computational fluid dynamics (CFD).The pressure distribution on the gas film grid nodes was calculated,and the complex gas flow in the transient flow field was simulated,and the pressure distribution，bearing capacity and the dynamic characteristic coefficients of the gas film were obtained.The results show that the static pressure effect can be effectively improved by increasing the supply pressure,the dynamic pressure effect can be improved by reducing the gas film thickness and increasing the rotation speed,and the coupling of dynamic and static pressure effects can improve the steady performance of the bearing.When the eccentricity is from 04 to 05,the average film thickness is from 8 to 12 μm,and the gas supply pressure is from 05 to 06 MPa,the dynamic and static pressure coupling effect is obvious,which can increase the bearing capacity of the gas film and the stability of the bearing at high speed.The stiffness coefficient of the bearing is increased first and then decreased with the increasing of gas film thickness,and is increased with the increasing of eccentricity.The variation of bearing damping coefficient with the increasing of film thickness and eccentricity is more complex,but it tends to increase as a whole.Therefore,reasonable selection of gas film thickness and eccentricity can improve the steady performance,dynamic characteristics and operating stability of spherical spiral groove hybrid gas bearings.