Metal plastic heat dissipation is still an unsolved problem. For example, the experimental results of the work-heat conversion coefficient and its strain and strain rate correlation in the existing literature are not consistent. In this paper, the heat dissipation characteristics of commercial purity titanium TA2 during tensile process at 0.1 s^(-1)-100 s^(-1) strain rate were studied. DIC and infrared temperature measurement synchronous test system were used to analyze the deformation and temperature field evolution process of plate tensile specimens. The experimental results show that when the strain rate is greater than 1 s^(-1), it can be approximately adiabatic before the necking of specimen. The Taylor-Quinney coefficient β of TA2 is not sensitive to the strain rate effect, however it is not a constant, but evolves with strain. In the initial stage of loading, β increases with the increase of strain, and reaches the maximum value of 0.92 when the tensile strain is about 9%. Then β decreases gradually with the development of strain, and it decreases to about 0.8 at 30% strain. The EBSD microscopic analysis of the specimens at different deformation stages indicates that the variation of Taylor-Quinney coefficient is related to the twinning and microstructure evolution during the deformation process.