Abstract: An improved particle swarm optimization (PSO) method isproposed for the position optimization of actuators invibration control problems. The system energy is adopted as the optimal index inthe method. A numerical example is calculated by the improved method andother optimal techniques. The results optimized by variousmethods are in good agreement, and the improved PSO method is moreefficient forsolving multi-position optimization problems of actuators in vibration controlproblems.