Because ETFE film is a high polymer material its visco-elastic characteristics are observed by the researchers. Besides, the linear expansion coefficient of the ETFE is 10 times greater compared to steel products or the like. For that reason, due to change in temperature, there are cases where expansion and contraction are regarded as an issue. Therefore, in order to design and construct ETFE film membrane structures, research focused on its visco-elastic characteristics has been done. For research focused on viscosity of ETFE film, in addition to that carried out by the authors, there is research by Moriyama and Kawabata1,2, by Jeongand Kawabata3, by Wu4, by Galliot and Luchsinger5 and by Li and Wu6 and so on. These studies take into account either the viscosity, the change in temperature or introducing the constitutive equation of FEM. There is no research that takes into account all of them.