To solve the problems such as cut tobacco segregation and high fine content and improve the control precision and stability in pneumatic feeding system, a new screw type cut tobacco distributor featuring a tobacco sieve and laterally fed was tested. The results showed that: the mentioned problems were solved effectively, whereby the structure of cut tobacco improved obviously. The proportions of medium to short strands increased by 2.41% and that of long strands by 2.34%, respectively; the small particle content reduced by 1.55%; the filling power increased by 0.12 cm³/g; the standard deviations of individual weight and draw resistance of cigarettes reduced by 4 mg/cig. and 32 Pa/cig., respectively; the tobacco loss from cigarette ends, fine content, deliveries of tar and CO averagely reduced by 1.23 mg/cig., 0.42%, 0.16 mg/cig and 0.28 mg/cig., respectively. And the smoking quality improved steadily.