The wind pressure disturbance is the direct cause of compressor rotating stall and surge. The magnetic-levitation compressor has the advantage of controlling the axial displacement of the magnetic levitation rotor to achieve the adjustment of compressor wind pressure. The principle of stabilizing suspension and axial displacement of magnetic levitation rotor is analyzed by establishing the dynamic equation of axial active bearing. A mathematical model of clearance and wind pressure is established by using parameters such as speed of direct relation of wind pressure, impeller height and tip clearance of impeller based on the above analysis.An experiment is carried out on the 30 kW magnetic-levitating compressor. Through data mining, it can be found that when the top gap of the impeller changes 0.1 mm and 0.2mm respectively,the numerical value of the wind pressure is very similar to that of the mathematical model. The experimental results also show that the tip clearance of impeller has a significant effect on the compressor wind pressure. For different fault states of the magnetic levitation compressor, different tip clearance of impeller can be selected to adjust the compressor according to mathematical model in this thesis.