Abstract: The process of cigarette smoke aerosol trapped by filaments with special cross section was shot with microscope and CCD technologies in an established microscopic examination channel. The obtained images were binarized to investigate the influences of denier per filament, particulate matter concentration and air velocity on the coverage rate of smoke aerosol on the windward surface of filament. The results showed that:at the same moment, the coverage rate of particulate matters on the windward surface of filament increased with the decrease of denier per filament with special cross section and the increase of particulate concentration, it also increased with the raise of air velocity within the range of 0.18 to 0.72 m/s.