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In this paper, PTFE coated fabric is taken as the research object.The uniaxial stress relaxation tests were carried out at five temperatures (23 ℃, 40℃, 50 ℃, 60℃, 70℃) and the effect of different initial tensile velocity (5N/s, 10N/s, 20N/s) on the stress relaxation properties of the coated fabric materials was also considered.The variations of the relaxation modulus were got.