Abstract: In order to research the effect of different airway structural of swirl nozzle on reducing yarn hairiness, in this research, we designed and used two groups swirl nozzle with different airway diameter and airway position. The comprehensive performance index of yarn were tested and conducted for comparison with the traditional ring spinning and compact spinning. The results showed that: the swirl nozzle with 1.4mm airway diameter was superior to the other two swirl nozzle which with 1.2mm and 1.6mm airway diameter, and airway position A is better than B and C, For 30tex Z twist yarn，swirl nozzle with 1.4mm airway diameter, and A airway position had the best performance. Under this condition, compared with that of traditional ring spun yarn, the S3 was reduced 74.2%, breaking strength was increased 5.4%; compared with that of compact spun yarn, the S3 was reduced 59.5%, breaking strength was decreased 4.0%. As a result, the effect of swirl nozzle reducing hairiness was remarkable.