With the development needs of high speed and high efficiency of bearing system,the assembly clearance between rotor and stator of magnetic-liquid double suspension bearing (MLDSB) decreases continuously,which leads to frequent rubbing accidents.Considering the coupling faults of rotor eccentricity ratio,rotating speed ratio,the MLDSB and stator rubbing,the “clearance-rubbing” dynamic differential equation of magnetic-liquid double suspension bearing rotor system was established and the rotor dynamic behavior was simulated numerically.The results show that with the eccentricity ratio increases,the rotor has evolved from periodic-1 to periodic-2,periodic-3,quasi-periodic,chaos and so on; the rotor displacement fluctuates violently,which is prone to bifurcation and even chaos,when the eccentricity ratio ρ changes from 0.28 to 0.4 and the speed ratio w changes from 1.2 to 1.7; the impact force at the rotor bearing and the turntable is the maximum respectively,when the speed ratio is near 1.5 and 1.67.