Abstract: The magnetically suspended rotor applied to the moving carrier may be subject to the base motion excitation， causing the rotor vibration， and even cause friction and system instability. To explore the vibration response of the magnetically suspended ro? tor under the base excitation， the numerical simulation and experimental verification are conducted. The effect of the base excita? tion on the rotor is introduced into the differential equation of the rotor motion in the form of an additional generalized force. Consid? ering the closed-loop control of the magnetic bearing， the dynamic model of the magnetically suspended rotor under base excitation is established. The influence of the excitation amplitude and frequency， the acceleration and shock width on the vibration response of the rotor is analyzed by numerical simulation. Finally， the base excitation experiments were conducted. The experimental results verify the accuracy of the magnetically suspended rotor model under the base excitation. The results show that the rotor vibration amplitude is proportional to the amplitude and square of frequency of the base harmonic excitation， the rotor vibration maximum is proportional to the base shock excitation acceleration. The proportional coefficient and differential coefficient of the magnetic bear? ing controller can suppress the rotor vibration brought by the base excitation