Abstract: The slippage of mechanical transmission and running of the hopper system in PASSIM and SUPER9 cigarette making and tipping machine combinations were analyzed theoretically. Industrial control computer was used to take the place of the variable speed control in the former hopper system, the hopper was driven by a separate electric motor directly, and centrally controlled. By modification, the system was simplified and achieved uniform and stable tobacco handling, cigarette quality was improved, and production cost was decreased.