In response to the concern about growing electromagnetic radiation rate, a great number of researchers focus on developing textile or textile based composites shielding materials. There are two common measurement techniques to determine the shielding effectiveness of textile materials in literature, namely coaxial transmission line method, shielding chamber method. There is no effective method for comparing the shielding effectiveness results measured using the coaxial transmission line method and the shielding chamber method. In this study, we developed a non-linear model to simulate SE results of the coaxial transmission line method according to shielding chamber method by using Differential Evolution Algorithm. It is concluded that the coaxial transmission line method can be used easily in the measurement of electromagnetic shielding effectiveness of composite textile materials by using our optimized model.