Abstract: The problem of guaranteed cost H_∞ robust reliable control is investigated for time delayed uncertain systems against actuator failure.Based on Lyapunov stability theory，a sufficient condition for the existence of guaranteed cost H_∞ robust reliable controller is derived and transformed to a Linear Matrix Inequality（LMI）.At the same time，the associated designing approach of the state-feedback controller is provided.The resultant robust reliable control systems not only retain asymptotic stability and disturbance attenuation with H_∞-norm bounds but also possess the performance index of guaranteed cost despite any outages within a prespecified subset of actuators.A numerical example shows the validity of the proposed design method.