Abstract: To prevent the packet overlap from opening and speed up packaging speed, the sideseam glue line heating device in YB45 slim cigarette packer was modified. For keeping the heating time unchanged, the number of heating units was increased from 36 to 48 and the 12-slot wheel drive mechanism was replaced by a 16-slot one. Meantime, the transmission system was redesigned. The modified YB45 packer was tested on cigarette brand "Septwolves (Fengmang)" in Xiamen Tobacco Industrial Limited Corporation. The results showed that the running speed of the modified YB45 packer raised from 280 to 350 packet/min, the rejected packets due to overlap opening decreased from 0.062 3% to 0.009 8% and the production efficiency of the packer increased by 9.3 percentage points. This technology provides a support for promoting the production efficiency of packaging equipment.