Abstract: In this paper, Butterworth standard transfer functions are firstly given, and then a method of designing state feedback system is proposed. The method includes: making use of the line transformation the controllable system changes into controllable standard form, making the closed-loop transfer function of controllable standard form system same as Butterworth standard transfer function, passing compare the gain matrix of state feedback is solved, then passing transformation the gain matrix of general controllable system is got. The example indicates the step response of the state feedback system is good. Key words: Butterworth Standard Transfer function;controllable standard form;state feedback;design