A novel control law using estimator resetting based on tracking models is proposed. This controller can significantly improve transient performance of a power system after disturbances while maintaining the global asymptotic stability of the whole system. The main idea of the new control is to design a proper tracking trajectory and drive to a new stable equilibrium point with less amplitude and higher speed. Firstly， a triangle structure system model is derived based on global signals. Then， one supplement damping item and initial states of tracking models are considered， and the back-stepping method is introduced due to the structural features. Finally， the control theory， independent of objects and their models， is derived and enjoys overwhelming superiority in large scale grids. The simulation results in MATLAB show the validity of the proposed designing method.