Abstract: Tensile tests of DC04 plate were carried out by using a universal material testing machine with an additional environ ment tank, the stress-strain curves were obtained at different temperatures and strain rates, and the corresponding temperature rise according to the adiabatic temperature rise formula was calculated. Norton-Hoff and Johnson-Cook models were used to describe the stress-strain relationship of DC04 materials, respectively. The results show that the Johnson-Cook constitutive model can reasonably describe its stress-strain relationship. Thermal mechanical coupling analysis of DC04 material during room temperature tensile test was carried out by using Ansys Workbench software and Johnson-Cook constitutive model to study the stress-strain relationship and the temperature changes. The simulated result of highest temperature of the sample is 47.39 ℃, and the temperature calculated by the theoretical formula is 46.4 ℃, the relative error of the two data is 2%, which is within the allowable error range. The stress-strain curve simulated by the Johnson-Cook constitutive model matches the test data, which proves the rationality of the Johnson-Cook constitutive model.