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.

• 从喷气纺纱的成纱原理及成纱结构出发，分析了喷气纱退拈时的结构变化，对喷气纱的所缠拈度测定进行了探讨，提出了在Y331拈度仪上测量计算喷气纱包缠拈度的方法。