In order to reveal the flow mechanism of the dynamic pressure gas bearing under the partial slip state and the effect on the bearing performance,the modified Reynolds equation considering the partial slip was established and solved with over relaxation iteration by coupling film thickness equation.The effects of slip state,eccentricity,gap size and coupled elastic foil on the gap film flow characteristics were numerically analyzed.The results show that the slip state of the fluid-solid interface has a significant effect on the rotor and stator gap flow and the bearing performance.Rotor side slip occurs in the pressure rise zone,which reduces the pressure in the high pressure zone.The stator side slip occurs in the pressure drop zone,which increases the pressure in the high pressure zone.Compared with the case of no slip,the interstitial gas film pressure peak value is increased by 12% during local slip.Within the parameters of this paper,as the eccentricity decreases and the gap height increases,the slip state of the gap interface gradually changes from the dominant rotor side slip to the dominant stator side slip.When the elastic foil is coupled,the slip area is increased by 1 to 4 times,the slip speed is increased by 2 to 8 times,and the gap gas film pressure presents a double peak distribution.