Abstract: Based on the spherical hinged tilting pad porous bearing，a tilting pad bearing porous-rotor system text rig is built. On the basis of analyzing the permeability characteristics of the porous tilting pad，the influence of different air supply modes，air pressures and rotor imbalances on the dynamic performance of the bearing-rotor system are studied. Research shows that：the permeability of the porous bearing is independent of the supply pressure；the critical speed of synchronous vibration of the rotor decreases and the critical resonance amplitude increases with the increase of the air pressure providing to the bearing as a whole；increasing the supply pressure of the upper bearing bush has little effect on the synchronous vibration of the rotor，and has a certain inhibitory effect on the sub-synchronous vibration；the rotor amplitude increases with the increase of the pressure of the lower bearing group，and the critical resonance speed changes oppositely；the rotor sub-synchronous vibration can be excited by the rotor unbalance.