In order to further improve the sealing performance of floating ring gas film seal,the floating ring seals with variable inclination groove were proposed.Three kinds of groove structures,the divergent groove with unfixed depth,the groove with fixed depth and the convergent groove with unfixed depth were selected as the research objects.FLUENT software was used to numerically simulate the dynamic pressure of the gas film model,and the influence of different working parameters on the sealing performance of the floating ring gas film in the micro-scale clearance was compared and analyzed.The results show that the introduction of medium gas into the micro-groove results in a pronounced localized high-pressure zone at the minimum clearance and at the base of the spiral groove.Among the three groove structures,the convergent groove with unfixed depth has the best sealing performance,the maximum opening force,and a more prominent leakage control.The opening force and leakage of the three types of groove structures increase with the increase of the rotational speed,pressure and eccentricity.