Aimed at the lower load capacity and stiffness of the aerostatic guideway,linear equalizing pressure grooves with rectangular cross section were designed on its working face.The influence of the equalizing pressure grooves,the orifices and the supply pressure on the static performance of the aerostatic bearing was investigated.The CFD (Computational Fluid Dynamics) model of bearings gas film was established,the mass flow rate of the bearing and the pressure distribution of the gas film were calculated,and the load capacity and stiffness of the bearing were obtained by differential film calculation.The change rules of bearing load capacity,stiffness and mass flow rate with different structural parameters were analyzed.The results are as follows that the load capacity and stiffness of the bearing is improved greatly by adding equalizing pressure grooves,but the air consumption is also increased.The load capacity of the bearing increases and the stiffness of the bearing increases firstly and then decreases with increasing the eccentricity.The depth of the equalizing pressure grooves,the diameter and numbers of the orifices and the supply pressure have great influence on bearing performance,while the width of the equalizing pressure grooves and the height of the orifices have little influence.