In view of the low accuracy of the theoretical empirical formula of axial force at the double-sided high-speed rotor end of the traditional air circulation machine,the numerical calculation takes a long time,this paper establishes a narrow gap calculation domain geometric model including double-sided high-speed rotor,and checks the accuracy of the model through experiments.On the basis of axial aerodynamic generation,the axial force is compared and calculated by theoretical formula method and CFD numerical calculation method.Based on the numerical simulation results of axial force,the calculation formula of axial force on the back side of the existing wheel is partially corrected,and a new set of axial aerodynamic calculation formula suitable for air flotation ACM is proposed,and the results show that the minimum error at the compressor end is reduced from 59% to 13% of the original formula,the maximum error is reduced from 261% to 75% of the original formula,the minimum error at the turbine end is reduced from 63% to 2% of the original formula,and the maximum error is reduced from 98% to 8% of the original formula.The new calculation method greatly reduces the error value of the axial force and aims to solve the problem that plagues the engineering side of how to accurately calculate the pneumatic axial force.