In order to study the blending effect of different stem morphology with leaf silk and understand the influence of different stem morphology on the comprehensive quality of slim cigarette, the mixing uniformity of filamentary and flake stems with leaf silk in processing were compared. Moreover, the influence of two kinds of stems on the quality stability of cigarette physical, smoke, sensory and combustion were investigated. The results showed that, compared with the flake stem, filamentary stem blending with leaf silk had higher mixing uniformity and good stability in the process of mixed silk and rolling. The physical quality of slim cigarettes blended with filamentary stem was better, but the single weight and the resistance were bigger. This may be related to the filamentary structure and filament ratio. The smoke index of the slim cigarettes blended with filamentary stem had better stability and the cigarette damage index was lower. The sensory quality was slightly better, and the number of the suction port and the smoke nicotine were higher. The slim cigarette blending with filamentary stem had better combustion stability and could reduce the combustion temperature 18 ℃ during slim cigarette aspiration.