In active structural vibration control, actuator's saturation and robust stability with respect to parameter uncertainties are practical and important issues. Saturated sliding mode controller and robust saturation controller, which were presented in previous researches, are suitable in this case. In this paper, robust stabilities of the two controllers are examined and compared through numerical simulations for a 2dof vibrating system. (c) 2006 Elsevier Ltd. All rights reserved.