Abstract: The high-quality control problem of total distributed system, especially of SCADA system is discussed. By taking into account the inherence of those manufacture equipment, a kind of control algorithm is put forward, because the algorithm is characterized by simpleness and being realized easily, it is very adapt to be applied on locale processor, and the control precision correspond with the capability of processor, the algorithm is also robust. So it is good reinforce in dynamic process control of SCADA system.

Key words: Auto disturbance rejection controller, Multithreading/multitask, SCADA system, Total distributed system, Tracking-differentiator