Abstract: The filter rod makers now used in the tobacco industry always have a similar V-shape groove,which rejects sequentially a number of filter plugs and results in material waste.A new rejection system,wherein only the targeted defective plug is rejected by means of automatic integration technology,was proposed.Taking servo drive controller as an example,the working procedure was explained.The rejection window formula which changed with the change of finished filter plug length was derived.The method for quickly finding out the optimal starting point of rejection and its correction by phase tracking was also described.The results of pilot test showed that in case of plug wrap joint,defects or segment missing plug,the sequential rejection system would reject at least 5 plugs,while the new system would reject 1 to 2 plugs.It means less material consumption.