The article introduced the mechanisms and characteristics of spinning system such as solo spinning, sirofil spinning, siro spinning and so on. New composite spinning technology can develop a composite yarn, thread and fabrics with different characteristics. Composite spinning technology is a new breakthrough in technology of ring-spun wool spinning. It makes a remarkable improvement in the quality of spinning. It improves the external quality of yarn. Through comparing and analyzing, the new technologies enable a great structural change and unique performance of the yarn. This new spinning technology has broad prospects for development applications.