针对高阶复杂系统提出一种分数阶内模控制器设计方法.利用微粒群算法(PSO)进行模型化简,基于内模控制(IMC)原理设计分数阶控制器,该控制器仅有一个可调参数,并根据鲁棒性能指标给出控制器参数整定的解析表达式.仿真结果表明,该方法可以使系统同时具有良好的目标值跟踪特性、扰动抑制特性以及克服参数变化的鲁棒性. Aiming at high-order complex system, a fractional order model controller design method is proposed. Particle swarm optimization (PSO) model simplification is used to design fractional order controller based on IMC principle. The controller has only one And the parameters of controller tuning are given according to the robust performance index.The simulation results show that this method can make the system have good target tracking characteristics, disturbance rejection characteristics and overcome the robustness of parameter changes.