Abstract: In order to promote the uniformity of cut strips and alleviate the fluctuation of cigarette weight, an online control system for the size uniformity of cut strips was designed based on TRIZ segmentation principle. The system included a separating cylinder to separate long strands from short ones, then long strands were clipped into medium to short strips and mixed back with the short strips completely to reduce the size difference. The results of experiment indicated that, it was preferable to set the said process after tobacco cutting, and the optimal parameters were the rotation speed of cylinder motor 600 r/min, the clearance between blades 3 mm, the rotation speeds of picker roller, low-speed and high-speed knife rollers 1 500, 720 and 2 880 r/min respectively. The cigarettes of brand "Golden Leaf (Hard Dihao)" were tested in Xuchang Cigarette Factory, the results showed that:1) The proportion of strands longer than 10 mm reduced to 0.48%, the proportion of cut strips of 2-4 mm in length was 62.60%, and cut strip structure became more uniform. Integral strand proportion was 82.76% and broken strand proportion was 1.12%, which met technical requirements. 2) The standard deviation of cigarette weight was 0.019 g, significantly lower than the average value of 0.022 g before installing the control system. The standard deviation of draw resistance of cigarette was 44.7 Pa, lower than the average value of 50.2 Pa before installing the control system. The dust content in cigarette was 1.39%, close to the value of 1.47% before installing the control system. This technology provides a technical support for promoting the consistency of cigarette weight.