Nylon Polyamide fiber (PA) is a synthetic fiber linked by amide bond. It is the first synthetic fiber to achieve industrial production in the world, and also one of the main varieties of chemical fiber. Polyamide has many advantages, such as excellent wear resistance, high fracture strength, good resilience and fatigue resistance, good moisture absorption and so on. As a result, polyamide has a wide application in the field of textile and clothing. In the field of traditional silk stockings, polyamide, as a very important raw material, has been occupying the vast majority of market share. In recent years, women's underwear and all kinds of body shaping clothing are popular in the international market. Their unique seamless, body shaping, moisture permeability, fashionable and beautiful characteristics make the consumers in China (especially female consumers) love them. In addition, a variety of Jin / Cotton (cotton / nylon) elastic Rome knitted fabrics have been accepted by more and more consumers, and are widely used in various high-end fashion and casual fabrics. In the field of high-grade carpets, polyamide fiber also occupies a larger market share. Polyamide fiber is also the main raw material for high grade lining. In recent years due to the polyamide fiber itself has light weight, easy dyeing, high elasticity and abrasion resistance, tear resistance, easy finishing etc., the polyamide fiber in outdoor sports especially outdoor light fields have been widely used, such as sportswear, jackets, fast drying, winter clothes, outdoor tents, sleeping bags, mountaineering bag.