Special yarn, also known as fancy yarn: refers to the yarn that using special raw materials, special equipments or special technology during the spinning production line and process and the fiber or yarn having special structure and appearance. Special yarn is a kind of decorative yarn in yarn products. In recent years, in the international yarn and fabric exhibition, special yarns and their fabrics are in great range. Special yarn woven products can be used in coats, suits, coats, shirts and skirts; fancy yarn knitted fabric can be widely used in the production of knitted garments. In addition, fancy yarns are widely used for weaving sweaters, hats, scarves, neckties, carpet and sofa cloth, curtain cloth, bedding and senior wall materials and other decorative cloth. Special yarns are made from a wide range of raw materials, including cotton, wool, silk, hemp, chemical fibers, and so on. There are many methods of special yarn production; and different methods can be combined to form new fancy yarn products. It is mainly divided into six major categories and more than 70 kinds.