Uniaxial tensile properties tests of ETFE film were carried out from 20℃ to -100℃.The test results show that the stress strain curve of ETFE film is nearly a continuous curve before the second yield point at low temperature（≤-40℃） while it is two straight lines at normal temperature（20℃）. The stress at the first yield point, the strain at the first yield point, the stress at the second yield point and the tensile strength of ETFE film show a nearly linear increase with decreasing temperature. The breaking elongation of ETFE film shows a nearly linear decrease with decreasing temperature. The strain at the second yield point changes a little with decreasing temperature. Compared with that at normal temperature(20℃), the tensile strength of ETFE film has improved greatly and the ductility of ETFE film has decreased obviously at low temperature. When temperature changes from 20℃ to -100℃,the change amplitude of secant elastic modulus of ETFE film is less than 10% and can be ignored for engineering design.