Abstract: Aiming at the vibration problems caused by the clearance fit between the angular contact bearings and the bearing chocks of the flywheel rotor’s upper and lower supports under complex conditions,and the vibration control problem in the vacuum environment,a combined force transmission support scheme of the cylindrical roller bearing for upper support,and both deep groove ball bearing and diagonal contact ball bearing for lower support of flywheel rotor is proposed,which solves the structural design problems such as axial force regulation,magnetic bearing failure,nonlinear supporting stiffness and deformation compatibility of support under complex conditions. In addition,an elastic support/dry friction damper（ESDFD）is used to reduce the radial vibration of the rotor. The coupling dynamic model of the flywheel rotor with ESDFDs is established by using the finite element method. Base on that,the dynamic characteristics of flywheel rotor is calculated,and the control effect of single/double damper on rotor vibration is analyzed. The results show that under the control of a single/double damper,the maximum vibration response of the first and second order mode is lower than30 μm and the vibration reduction ratio exceeds 90%.