利用修正的短轴承理论模型对转子－轴承系统进行了稳定性、分岔与混沌特性分析。结果表明：系统平衡失稳时产生迟滞超临界Ｈｏｐｆ分岔，由于迟滞的存在，使得迟滞区内系统拓扑结构的等价性在大扰动下可能被被破坏，因此，线性理论无法解释该区段内的动态行为。存在不平衡量时，系统失稳可能产生拟周期分岔、倍周期分岔并可能导致混沌振动。这些结果为控制转子的稳定运行状态提供了依据，为油膜失稳故障的诊断提供了有益的启发。 The stability, bifurcation and chaos characteristics of rotor-bearing system are analyzed by using the modified theoretical model of short bearing. The results show that the hysteretic supercritical Hopf bifurcation occurs when the system is in unstable equilibrium. Due to the existence of hysteresis, the equivalence of the system topology in the hysteresis region may be destroyed under large disturbances. Therefore, linear theory can not explain this section Within the dynamic behavior. In the presence of unbalance, system instability may produce quasi-periodic bifurcation, doubling period bifurcation and possibly chaotic vibrations. These results provide a basis for controlling the steady state of the rotor and provide a useful inspiration for the fault diagnosis of the oil film.