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The looseness and moisture regain belongs to large time delay system, the feed-cascade control used for the moisture content control of the outlet tobacco leaves can not achieve ideal control effect. In the process of production, it is necessary to manually modify the water adding coefficient according to experience, and do not truly realize complete automation control. A new method of combining expert system, fuzzy inference and PID control is proposed to control the outlet moisture content of the looseness and moisture regain. The expert system is used to make decision on water adding coefficient automatically, and the fuzzy inference method is used to tune the PID parameters of the front chamber water controller and the back chamber moisture controller respectively online. The full automatization control of the outlet moisture content of the looseness and moisture regain is realized, and the stability and accuracy of the outlet moisture content of the looseness and moisture regain are improved.