Abstract: This paper gives a new algorithm for the twice optimum control in the system with dead-time. All the twice optimum algorithms, not only in the finite space but also in the infinite space, are all employing ITAE optimal control law to do it. In this kind of system, there is an important regularity named the law of run in the opposite direction:the smaller the overshoot of first optimum in the finite space, and greater the overshoot of the second optimum in the infinite space, the stronger the system robustness. Finally, discuss an example, the results show that its robust is very strong. This is the need of many process control system.