Abstract: In YB47 packer, the break in conveying belt joint tends to damage cigarette packets due to jam in the discharge passage, therefore the passage was modified by analyzing the movement relationship between cigarette packet and conveying belt. The motor, conveying belt, pulleys were removed. The bottom belt was replaced by a steel guide plate with grain-shaped surface to reduce the frictional force between cigarette packets and the plate, ensure the speed of cigarette packet for entering pneumatic lifter and avoid the damage of cigarette packet. The results of application showed that the machine failures caused by belt joint break were avoided, the quality of cigarette packets was guaranteed, the working life of the guide plate reached 24 months, 6 conveying belts were saved for a packer per year, the running cost of machine was reduced, and the machine efficiency was increased.