Fiber trajectory was simulated by Matlab software，effects of inspiratory negative pressure of lattice apron type compact spinning system and different friction coefficient in outer surface of lattice apron on effects of band effect in zone accumulation were researched，and its yarn quality was compared with that of regular spinning.The resulted showed that when negative pressure was 2 350Pa，friction coefficient of lattice apron was 0.6 fibre accumulated rapidly and accumulation-adjusting time was short；the period of steady accumulation was extended；fibre accumulation could be effectively controlled by airflow in accumulation zone. By using compact spinning technology，strength of the yarn increased by 16.5% evenness of yarn USTER increased by 5.7%，filoplume reduced by 58.37% compared with normal yarn.