The Reynolds equation is usually simplified in gas bearing calculations,and the effects of inertial forces is ignored.When the bearing speed is very large,the effect of inertial force of the gas will increase,ignoring the inertia force will cause a large error.The theoretical calculation model of highspeed spiral groove gas thrust bearing considering inertial force was established.The finite element method was used to solve the Reynolds equation,and the gas film pressure distribution and bearing capacity were calculated when considering the inertial force.The change of bearing capacity with speed was analyzed.It is found that the inertial force of the gas at high speed will significantly reduce the bearing capacity of the bearing.The effect of various parameter on the bearing capacity was analyzed under the high bearing speed of 50 000 r/min.The results show that when the depth of the spiral groove and the ratio of the groove length change,the bearing capacity will have a maximum value,and the effect of the inertial force is the greatest when the maximum value occurs.As the film thickness increases,the bearing capacity is gradually decreased,and the effect of inertial force is gradually increased.As the number of spiral grooves increases,the bearing capacity is increased gradually,and the effect of inertial force is relatively stable.The effect of rotor axis tilt on the bearing capacity was analyzed.It is found that the bearing capacity is increased slightly when the rotor axis is tilted under the same rotation speed and the same bearing parameters.