Although the fuzzy control technique is fit for controlling non-linear and uncertain processes, the conventional fuzzy control system lacks self-adjusting ability, which restrains clearly the fuzzy control technique for widely application. Firstly this paper studies the relation between the adjusting scale factors and the control performance for the PID type fuzzy controller, and then proposes a method for tuning parameters of the PID type fuzzy controller, which makes the control system proposed in the pap...