Abstract: To understand the effects of nozzles' pressure on the performances of disc swirl spun yarn,twenty kinds of yarn were made with varied pressure of two nozzles respectively,while keeping other process parameters constant. Yarn performances such as coverage,breaking force,breaking elongation and breaking force ratio were tested,and the results of the test were analyzed. Results show that the collocation of two nozzles' pressure has a great effect on the yarn performance.When the pressure of the first nozzle is at 0 30～0 35 MPa and the pressure of the second nozzle is at 0 60～0 62 MPa,the yarn shows a good performance.