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The design of controllers are difficult because of the complex and high order control systems, which reduce the dynamic performance and robustness. First, this paper briefly introduces the common methods of H₂ norm model reduction, then a new model reduction based on that is proposed, which extends to the fractional order after the mode reduction and models a large variety of higher order systems with greater accuracy. And the optimal fractional PID controller is designed with the constraint conditions of the reduced order model of the phase margin and gain crossover frequency and robustness to gain variation. The simulation experiments prove that compared with the original closed-loop control system, the controlled by optimized fractional order PID can get better dynamic performance and have strong robust.