Abstract: A method for evaluating the blending results of blended cut tobacco based on the uniformity of tracer was explored and developed by using CO₂ expanded cut tobacco as a tracer, further, the blending results after various process steps were investigated with the method. The results showed that from the outlet of primary blending silo to the outlet of cigarette maker, the standard deviation of expanded cut tobacco content in blended cut tobacco decreased from 2.139% to 0.483%, the uniformity of cut tobacco blending improved significantly. The VRRs (Variance Reduction Ratio) of flavoring cylinder and cigarette maker were 5.389 and 6.387, respectively, their blending performances were significantly better than those of other processes. However, the uniformity of cut tobacco blending reduced to a certain extent during pneumatic tobacco feeding.