Spandex is the abbreviation of polyurethane fiber, which is a kind of elastic fiber. Spandex is generally composed of multiple filaments, usually 10D/thread. Currently, there are 15D/threads, or even 20D/threads. The fewer theoretical threads, the better the evenness of evenness. DMAC, the production solution of method spinning, is harmful to the human liver. Generally, 10D/root contains 0.5mg/kg, and if 15D/root contains 0.7mg/kg, it exceeds the standard. When producing Spandex, special attention should be paid to the winding tension, the number of counts on the cylinder, the breaking strength, the breaking elongation, the forming degree, the oil adhesion amount, the elastic recovery rate, etc. These problems directly affect the weaving, especially the knitting production. More attention should be paid to single-sided cloth.