Abstract: The relationships between size distribution and blending uniformity of cut stem all the way from cutting, through expanding to tobacco rod making were studied.The cut stem samples were made by three different stem cutting processes, including cutting stems twice, cutting rolled stems and cutting stems directly without rolling.The results showed that the cut stem sized in the range of 3mm to 7mm had the most stable pattern, when its proportion in a cut stem sample was over 80 percent, the blending uniformity of cut stem in finished cigarette was the highest. The draw resistance of cigarette was scarcely affected by the size distribution of cut stem, however, the extent of fluctuation of draw resistance was affected greatly by the same.