According to the problems existing in the control of centralized air supplying system, a new fuzzy algorithm is presented in this paper. The algorithm adopts offline computation, online lookup table and the weighted recursive average filter algorithm, which has small computation amount. It bears not only the traditional PID experiences, but also the self-adaptive characteristic of fuzzy control. It can solve the problem of the jumping of control system when the fuzzy output changes. The practice proves that this algorithm offers many advantages including rapid response, small overshoot, high accuracy, and strong ability of anti-jamming and self-adaptation, etc. The undulation and the adjust time of the pressure and flow have been decreased obviously. The undulation has been decreased over 1.2%, and the adjust time has been decreased over 1.3 s. It is useful for realizing senior technique of control with PLC in the field of industry.