In the paper, the finite element computational model of rotor-bearing system is presented using the software DyRoBeS. Based on the numerical simulating method, dynamical characteristics in the different working conditions of bearing are analyzed such as span, width, gap and so on. By the theoretical analysis of critical speed and spectrum cascades, the changing rule of stability of the rotor system and the reason of oil whirl and oil whip are discovered. The influence of parameters on the system stability is different, and the significant effect is attained by one or two parameters. The investigation is helpful to design the bearing and optimize the rotor-bearing system in a turbocharger.

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