The load capacity characteristic of aerodynamic journal bearing was studied by numerically simulating the state nonlinear Reynolds equation.The finite difference method(FDM ) coupled with proportion division method were used to solve Reynolds equation by using successive over relaxation method in MATLAB programming.The load capacity was calculated by using the pressure distribution of the film,and the maximum deviation is less than 11% by comparing with CFD.The relationship between eccentricity ratio,sets of orifices,rotating speed and load capacity was studied.The results show that load capacity is improved with the increase of eccentricity ratio,row number of orifices and rotating speed.For the bearing with double rows of orifices,the area between orifices can improve the load capacity,and also weaken the influence of hydrodynamic effect.