Abstract: A method is introduced for designing a controller based on the feature data of a control system. According to the input and output data of a controlled object only, this method identifies an impulse response by means of the convolution theorem. The impulse response data are taken as the feature data of the control system. With the controlling signal in a certain scope, the output reference data and the fastest control signal are calculated according to the feature data to meet the requirements of the fastest response.Then the ideal feature data of the controller are worked out on the basis of the control goal and the fastest control signal. Finally the linear parameters of the controller are identified by the feature data. Simulation results show that the control result has the characteristic of the fastest reference control.