To study the influence of the misalignment of foil gas bearing on the performance of bearing during operation,the foil gas thrust bearing was selected as the research object.Starting from the Reynolds equation,the distribution of film thickness in each part of the bearing was studied under the angular misalignment.Combined with the boundary conditions,the Newton iterative algorithm was used to obtain the film pressure.The influence of misalignment on bearing capacity and friction moment of foil thrust bearing was analyzed.The results show that the angular misalignment has a great influence on the performance of the foil thrust bearing.With the increase of the deflection,the maximum gas film pressure is increased and the pressure distribution of the bearing becomes more and more uneven,the friction torque of the bearing is increased and the system stability of the bearing is greatly reduced,while the bearing capacity is enhanced.When the misalignment angle is too large,the convergence result cannot be obtained and the bearing is almost ineffective,and compared with the normal operation of the foil thrust bearing,the performance is greatly reduced.The increase of the number of fanshaped foils will reduce the bearing capacity and stability