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With the establishment of the nonlinear coupled lateral and torsion vibration equations of rub-impact Jeffcott rotor and through numerical simulations,the influences on lateral and torsion vibration behavior by rotor-to-stator clearance are analyzed,which prove that there is strong impact on coupled lateral and torsion vibration behavior.Smaller the clearance is,more complex the motion of rotor is.When the clearance is larger,the frequency spectrum of rub-impact rotor is mainly composed of 1/2X,1/3X and 1/4X components.With the decrease of clearance,quasi-periodic and chaotic motions will be present.Under different clearances,the bifurcation diagrams of lateral and torsion vibrations can be divided into rub-free zone,rub-light zone and three complex motion zones in which the motion trend of lateral vibration is similar to that of the torsion vibration.Compared with the lateral vibration,the torsion vibration is of more motion forms and more abundant frequency components in amplitude spectrum.