Beginning with the structural characteristics of ball bearings,the parametric vibration of single radial ball bearing-rotor system,which is induced by the varying compliance vibration,is studied through the analysis of the stress state in bearing,then a series of forced vibrations caused by the manufacture error and the installation deflection of the bearing are analyzed,and different frequency components of the nonlinear vibration result from rolling bearing are summarized. Finally,a validation test is carried out on a 120MD60Y6-type motorized spindle,and vibration signals are purified with the use of the low-pass filtering and band-pass filtering. The results from the spectrum analysis show that the vibration frequency components produced by the single radial ball bearing take a large proportion in vibration signals at low speed. With the rise of the rotational speed,the amplitudes of these vibration frequency components vary slightly,meanwhile the proportion of their amplitudes in vibration signals decrease abruptly. These conclusions are useful to the fault diagnosis and the dynamic analysis of rolling bearing-rotor system.