Abstract: Considering the shortages of common rotor-stator rubbing models,using ANSYS software,a new rotor-stator rubbing model was presented based on the relationship between relative normal displacement and normal contact force.Then the rotor-stator dynamic equations were established by combining with the Whole Transfer Coefficient Method(WTCM).The dynamic characteristics were calculated by the WTCM,and then the transient responses of dual-rotor system were solved.The responses were analyzed by the time-domain curve,the Fourier transform and the wavelet transform respectively.Furthermore the fault characteristics were deduced and discussed.These results provide some reference for fault diagnosis of dual-rotor system.