Abstract: In order to explore a new method to lead yarn in swirl spinning, the closed fibers-converging device of swirl spinning is improved by designed with lead yarn channel and yarn guide roller. The yarn is formed by fetching the converged fiber bundles and then twisting the bundles through the swirl nozzle. This paper firstly analyzes the different improvements on the before and after fibers-converging device and the principles of yarn. And then the yarn spun through changing the pressure of the swirl nozzle, is tested two main performances such as breaking force, yarn hairiness. Through the results of analyzing the tests and the changes in the structure of yarn analyzed by electron microscope, we can find the method can be used to spin cotton yarn, the air pressure also have a big influence on the yarn quality and the yarn of improved swirl spinning have different from appearances from before. The results provide a basis for the study on the new fibers-converging device of swirl spinning.