Aramid fiber, fully known as "polyphenylene terephthalamide", has excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid resistance, alkali resistance, light weight, etc. Aramid fiber was successfully developed and commercialized by DuPont Kevlar Fabrics in 1960 s. Therefore, before the emergence of carbon fiber, Aramid fiber has always occupied the high-performance fiber market.