Abstract: The loose end cigarette is detected and rejected at the position of packet mandrel in existing cigarette packers,a whole group of cigarettes have to be rejected once a loose end cigarette is detected,which results in material waste and low efficiency.Therefore,a single-cigarette rejecting system was designed,which was composed of major electric control cabinet,man-machine interface screen,working table guard,detector and rejecting mechanism.The detector system was installed in the discharge channels of the cigarette hopper,it detected cigarettes,the defective cigarette was rejected at a rejecting point.The practical application results indicated that the system was stable in running,simple in structure and convenient in operation,with a rejecting rate up to 83.7%.Comparing with traditional packet rejecting system,the new system saved 11205 packets against 5613 thousand packets,the total production in a period of 4 months.