Abstract: The vibration reduction characteristic of rotor system with active elastic support dry friction damper is studied in this paper. The dynamic model of rotor system is established and a 2D friction model of contact surface in dry friction damper us built. The transient and steady state dynamic responses of rotor system are obtained after dynamic equations being solved by utilizing Newmark-HHT numerical integration method. The steady state vibration signals of dry friction damper rotor system under different normal load are compared， meanwhile the transient dynamic responses of rotor system before and after turning on dry friction damper are studied. Experimental test rig for rotor system and dry friction damper are set up. The vibration signals of rotor while passing the first-second critical speed regions are measured and analyzed. Then the experimental vibration signals are compared with simulation vibration responses to verify the vibration reduction effect， and the vibration attenuation characteristic of dry friction damper on rotor system under different working conditions is studied. The results show that the active elastic support dry friction damper could only attenuate rotor’s vibration within a certain normal force. Finally， the results could provide theoretical guide for vibration control strategy on rotor system.