Multiple piezoelectric actuators may be used due to the fact that performance of a single piezoelectric actuator sometimes has limitations. This paper studies the delayed vibration control of a flexible cantilever beam with double piezoelectric actuators. First， without considering the time delay in the control loop， it is observed that double actuators can achieve the same vibration control effect even though the actuator distribution is different. In this case， the input voltages of the two actuators are linearly related， and the slope of the linear relation is determined by the actuator distribution. Then， in the presence of time delay， we prove that by using a piecewise delayed state feedback， the same control performance can still be achieved when the actuator distribution as well as the time delay of the control loop is different.