Abstract:High-temperature and electro-assisted tensile experiments were conducted on TC4 titanium alloy, with the deformation temperature of 600?900 ℃ and the current density of 14?22 A/mm2. The effects of temperature and current density on the flow stress of the alloy were investigated. The experimental results show that during the hot tensile process, the flow stress of the material decreases with the increase in temperature, and the elongation is positively correlated with temperature. The flow stress of the material decreases after applying pulsed current, and the elongation first increases and then decreases with the increase in current density. Finally, based on the true stress-true strain data of tension, a multi-physical field constitutive model coupling thermal and athermal effects was constructed on the basis of the original Johnson-Cook model framework. The constitutive model parameters were determined by the regression fitting method, and error analysis was performed between the experimental and predicted values. The results show that the coefficient of determination R2 of the constitutive model is more than 0.95, the mean relative error is less than 2.5%, which indicates that the model has relatively good predictive ability within a wide range of process parameters. The research aims to provide a theoretical basis for the electro-assisted forming of titanium alloys and a reference for optimizing forming process parameters.