PID 参数优化是自动控制领域研究的一个重要问题. 提出了一种差分演化算法的PID 参数优化算法, 同时, 为了增强算法的易用性, 对差分演化算法中的缩放因子采用随机产生 的方法. 通过仿真实验验证了改进差分演化算法在PID 参数优化中的有效性和可行性。 关键字: PID 参数优化; 差分演化算法; 缩放因子; 自动控制 Abstract: The optimization of the PID parameters is very important in the automatic control field. In this paper, an improved Differential Evolution (DE) algorithm is proposed to optimize the PID parameters. In order to make DE algorithm easier to use, the scaling factor of DE is generated randomly from [0, 1] instead of user pre-defined. The experimental results indicate the DE based PID controller is feasible and efficient. Keywords: PID parameters optimum; differential evolution; scaling factor; automatic control