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The unified gas-kinetic scheme (UGKS) is introduced and used in this paper to study the slider air bearing problem.The UGKS solutions are first validated with the comparison of direct simulation Monte Carlo (DSMC) results.ARer validation, the UGKS is used to study the air-bearing problem under different non-equilibrium conditions.On the surface of the slider, the dependency of the gas pressure and normal force on the Mach and Knudsen numbers are fully evaluated.The non-equilibrium effect on the force loading in the whole transition regime up to the free molecular limit is fully evaluated.