Abstract: To comprehensively and objectively evaluate the quality and stability of online laser perforation in slim cigarettes, a high-precision laser scanning technique was used to measure seven key indicators: hole length, hole width, hole depth, upper surface area, internal surface area, the distance from the mouth end to the first row of performations, and filter ventilation. The efficiency coefficient method was used to assign a quantitative score to each indicator, and the CRITIC (Criteria importance through intercriteria correlation) method was used to determine the weight of each indicator, thereby a comprehensive quality evaluation method for online laser perforation in slim cigarettes was established. The results showed that the proposed method enabled comprehensive evaluation of laser perforation quality of slim cigarettes of different brands based on the seven indicators. Brand C had the highest mean comprehensive score and the smallest standard deviation, indicating better laser perforation quality and process stability. The mean comprehensive score for laser perforation quality was positively correlated with the filter ventilation conformity rate, whereas the standard deviation of the comprehensive score was negatively correlated with the process performance index (P_pk). The developed method enables objective evaluation of online laser perforation quality in slim cigarettes and provides a practical basis for process optimization and process quality control.