Methods: there were 15 palletizing robots in the factory. They were used to palletizing normal and circular cigarette packing cases with different specifications of cigarette products. The drop number of cigarette packing cases was counted and averaged 3 months before and after improvement. Before the improvement, the speed of palletizing robot was 60% of the full speed, and after the improvement, the speed of the palletizing robot was 80% of the full speed. The shutdown times of the palletizing robot were counted and the palletizing efficiency of the palletizing robot was calculated.