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Some factors such as the changing pipeline characteristic make the pressure difference model of the second pump of chilled water system be uncertain in the central air condition, which maybe make the adjusting performance of PID algorithm get worse, even make the pressure difference of the second pump be out control. The MFAC (Model Free Adaptive Control) is a combined method with universal model and control function, which can runs without any model of control object and be parameter adaptive and structure adaptive. It is introduced in this paper to improve control result of the pressure difference of the second pump, which ensures that the settling time and the overshoot are good. The simulation and experiment show that the MFAC can overcome the uncertainty of model and control the pressure difference with good robust and anti-interference ability and adaptive ability comparing with the traditional PID control algorithm.