Abstract: This paper describes in some detail the method for computing an axial-flow compressor flow field under distortion.Based on the multiple-sector parallel compressor model and stream line curvature method,the stage distributions of the parametres of distorted flow field,such as total pressure,total temperature,static pressure,static temperature,air velocity and swirl angle,are obtained by solving the radial-equilibrium equation,then the details of compressor flow field under the given inlet distortion can be reached.As an example the flow field computation for a single stage compressor has been completed under the inlet circumferential distortion.The results demonstrate the practical value of the method.