Abstract: In order to prevent filter plugs in the shifting drum from dropping off due to out of position, by analyzing the structure of the shifting drum, the air blocking blocks were modified via fluid analysis and simulation methods. Besides air blocking and shifted filter plug stopping, the functions of airflow sealing and guiding, and filter plug positioning were added. The suction in the shifting drum was intensified to ensure that the filter plugs were firmly held in the grooves by suction after arriving at their right positions, and ensure that the filter plugs were smoothly conveyed and transferred. Test running was carried out on two ZJ116 cigarette makers, the results showed that the times of machine shutdown significantly reduced, the mechanical wear of the plastic plate caused by shifting drum was avoided; the times of filter dropping off and rolling plate jam decreased by 3.9 times per day, and plastic plate replacement decreased by 25 pieces per year. This technique provides a technical support for promoting the running stability of cigarette maker.