Abstract: A new fuzzy nonlinear PID controller is proposed, which adopts the fuzzy mapping relations between one-dimensional input and one-dimensional output and the cascaded mode of traditional PID controller. One-dimensional fuzzy controller, which has no scaling factors to adjust and only needs simple five rules, is easy to be realized. Simulation results and evaluation criteria for function behaviors of the controller show that the proposed PID controller has better performance than the conventional PID and other nonlinear PID controllers.