Abstract: Polyester fabrics are often used for airship structures because of their light-weight, high-strength and environmental resistance properties, their creep failure behavior under high stress levels determines the long-term safety performance of airship structures, but there is no relevant test standard or research at present. In order to study the creep properties of polyester fabrics, a membrane material composed of Vectran fibers was selected to carry out uniaxial tensile creep tests at 4 high stress levels: 85%, 80%, 75% and 70% of ultimate stress. The variation laws of creep strain, creep modulus and creep failure time with respect to stress level were summarized, and the fitting formulas of creep rupture envelopes were given through Newton iterative calculation. When the stress level is lower than 63% of the ultimate stress, the fabrics will not reach the creep rupture point. Based on the experimental data, the parametric four element creep model and creep failure criterions are established. It is found that the fitting model can generally reflect the creep failure reactions under high stress levels.