The universal creep function is successful in relating the creep (ε) to the ageing time (ta ), coefficient of retardation time (β), and intrinsic time (t0). The relation was used to treat the creep experimental data for polystyrene (PS) specimens at a given aged time and different stress levels. Comparing with "middle-point"method reported in the literatures,β is found out by another method "polynomial fitting" in this work. Then unified master lines were constructed with the treated data and curves according to the universal equation. The master lines can be used to predict the long-term creep behaviour and lifetime by extrapolating to a required ultimate strain.