In this study, infrared thermography is used to detect the thermal effects of rubber-like materials during loading-unloading cycles. Two salient features of temperature change have been observed: (1) the temperature has a tiny decrease at first and then becomes to increase during the stretching process, which is in agreement with the thermo-elastic inversion effect. (2) Temperature variation is partly reversible in the first cycle and totally reversible in the following cycles. These phenomena are related to complicated deformation mechanisms. Based on the analysis of elastic thermal effects during deformation process, thermodynamics of rubber elasticity has also been investigated by infrared thermography.