Abstract: The fatigue properties of steel-cord rubber composite under T-T loading are studied in this paper. The effects of maximum stress and frequency on fatigue life are analyzed and the hysteretic loss and the variation of temperature during the cyclic tension are obtained as well. A linear life prediction equation is given in terms of the fatigue-life diagram. The results indicate that the increase in the maximum strain exhibits a three-stage tendency. The two-step experiments demonstrate that this tendency also exists in the fatigue process of defected specimens.