In order to improve the load capacity characteristic of hybrid bearings,taking the hybrid bearings with herringbone groove and microorifice as the research object,the gas film flow field characteristic and the load characteristic of gas bearings were analyzed by using fluid mechanics theory.The variation law of the load capacity characteristic of the hybrid bearings with herringbone groove and microorifice at different speeds was studied,and the influence of the number and geometric parameters of the herringbone grooves on the load capacity characteristic of gas bearing under different eccentricities was analyzed.The results show that with the increase of rotational speed,the dynamic pressure effect produced by herringbone groove is increased continuously,and the bearing capacity of gas bearing is increased continuously.The bearing capacity of gas bearing is increased with the increase of the eccentricity.As the number of grooves increases,the bearing capacity of gas bearing under the same eccentricity is increased gradually.The bearing capacity of gas bearing is increased rapidly when the number of grooves is less than 10,and is increased slowly when the number of grooves is more than 10.The bearing capacity of gas bearing is increased first and then decreased slightly with the increase of the groove depth ratio and the groove width ratio,and the bearing capacity reaches a maximum value at the groove depth ratio of 2.4 and the groove width ratio of 0.55