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The placement of the piezoelectric actuator and H2 control system in a smart structure are simultaneously optimized by the genetic algorithm to achieve an enhanced vibration control performance. Efficient optimization algorithm based on a two-step procedure is employed in the simultaneous optimization. in which the optimal piezoelectric placement and state feedback controller are obtained by the genetic algorithm at the 1st-step and then the dynamic compensator for the output feedback is reconstructed at the 2nd-step of the optimization. It is verified by sonic applications with a plate structure and a magnetic disk drive that an enhanced performance for the vibration suppression can be achieved by the optimal design presented.