Abstract: The conventional PID control algorithm or artificial intelligence method used in tobacco processing is not competent for controlling combined integrating system effectively because of poor resistance to disturbance and low control precision(the precision of moisture content of output dried cut tobacco can only be controlled within the range of ±0.5%).A new control algorithm for combined integrating system was designed based on the basic principle of model predicting control,and the transfer function and character of the new algorithm were analyzed.The application of the new control scheme in controlling a cut tobacco drier indicates that the control precision is improved,the precision of moisture content of output cut tobacco can be controlled consistently within the range of ±0.3% regardless of input fluctuations.