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针对一类二阶不稳定时滞系统的抗扰动鲁棒性和动态响应问题，提出二次优化控制结构整形的方法来实现其优化控制。首先运用二次优化控制原理，设计系统的无穷维控制器和观测器。然后再用增强局部反馈Kf的结构整形方法，来消除其过渡过程中出现的微振现象。最后通过实例仿真与内模滤波器PID （proportional-integral-derivative）、改进型Smith两种方案作对比研究，证明了本文方法在跟踪响应以及抗扰动鲁棒性方面的优越性。“,”Regarding the robustness and dynamic response issue of unstable second order process with time delay, we propose a twice optimal control structure adjustment method to realize its optimization control.First,we use twice optimal control principle to design infinite dimensional controller and observer for the system.Then we increase the local feedback Kf value of structure adjustment to eliminate the oscillation during the transition process of twice optimal control system.Finally,simulation studies have been demonstrated to show the track-ing response and disturbance resistance robustness advantages of the proposed method compared with two other schemes including PID based on internal model control (IMC)filter and modified Smith.