Auxiliary bearing are mainly used for the temporary auxiliary support during the failure of the magnetic bearings,which are mainly divided into two categories,the rolling bearings and the plain bearings.However,the rolling bearings have a smaller load capacity because of the point contact between the ball and the ring,while plain bearings have a large friction and friction heat.The current research status of the auxiliary bearings was simply summarized,the rollingsliding integrated auxiliary bearing was proposed.The impact force and the axial displacement during rotor drop in the auxiliary bearing were preliminarily simulated by using the finite element analysis software LSDYNA.The simulation results show that,compared with ordinary rolling bearings,the rollingsliding integrated auxiliary bearings can effectively reduce the impact between high speed rotor and the auxiliary bearing during the drop down.Assuming that the rotor is balanced,the initial speed has a little influence on the impact force,but it has a great influence on the drop rebound height.The static friction coefficient has less influence on the rotor drop motion and the maximum impact force.