The performance of knitted fabrics made of untwisted yarn and traditional cotton yarn are compared, and the properties of untwisted yarn and its fabric are studied in this article.

The yarn is twisted, exposed to heat which sets the twist in place, cooled and untwisted.

This paper proceeds from the forming principle and the structure of a yarn of air-jet Spinning, We analyse the change in the yarn Struture When air-jet Spin-ning yarn is untwisted.