Abstract: Azimuth system of infrared photogenic objective simulator is a system of fast time-varying parameters. A dual self-tuning PID controller is presented with respect to the special case of the system. At each adaptive step, the optical parameters of PID controller are derived through online spectral factorization, then the controller is modified based on bicriteria. And a dual self-tuning PID controller that has dual effectiveness is derived and it is very simple for implementation. It successfully eliminates "turn off", " windup " and " bursting " phenomena of conventional adaptive control systems. This controller is suitable for stochastic parameters or fast time-varying systems.