Abstract: In order to move innerliners more smoothly in YB45A hard packer, the innerliner conveying device was improved as following:1) modifying the suction assembly, where the single-row hole suction formed by the suction chamber together with the suction plate was replaced by double-groove suction formed by the suction chamber alone and the suction belt was modified accordingly to avoid the drift and jam of innerliners; 2) modifying the accelerating roller pair subassembly, where the plain rollers were replaced by engraved rollers to avoid the deviation of innerliners in the process of acceleration and separation. The slim cigarettes of brand "A" were tested, and the results showed that:1) Olive oil or paraffin application on the surface of innerliner to ensure normal machine running was no longer necessary. 2) The running speed raised from 280 to 330 packet/min, meanwhile the rate of innerliner defects decreased from 8.26‰ to 2.39‰ and the machine efficiency increased from 88.5% to 93.4%. 3) The consumption of label, tobacco and innerliner reduced remarkably. This technology obviously promotes the running stability of YB45A hard packer.