The composite material Aramid fiber Ⅲ has many excellent capabilities such as high strength, high modulus, tolerance for high temperatures and so on.The material is widely used in aviation and military industries and as well as in many other fields.This thesis illustrates the main factors which influence the strengthened complex capabilities of aramid fiber Ⅲ, and more specifically introduces and discusses the factors that influence the aramid fiber Ⅲ itself.