Abstract: System with pure time delay is a kind of system quite difficult to control.Our traditional method forcontrolling such a system is to use a Smith predictor.By means of this method we can obtain good responsibility for reference inputs.Nevertheless it has many defects.First,it can not eliminate the influenceof external interference.It can even bring in some static deviation.Moreover,its robustness is not very welland sensitive to deviation of mathematical model.Recently several measures have been suggested to impove its performance.But they have certain limi-tations.In this paper,we suggest a new approach which considers the main problems in all respects,and leadsto better total performance.We have used,for example,the data of electric slag furnace to show betterperfomances due to this approach.