Bremsstrahlung radiative correction in QED at finite temperature

Based fully on the finite temperature field theory, we calculate the Feynma n diagram to analyse the new infrared divergence caused by the temperature effect in the bremsstrahlung process. It turns out that both of the infrare d divergence at the zero and finite temperature can be cancelled by the ide ntical Feynman diagram of virtual processes. We derive the probability of r adiating a net energy omega in bremsstrahlung processes and the result in E ikonal approximation is the same as that obtained in the semi-classical app roximation.