Abstract: To obtain the temperature distribution difference between the thermoelectric modules（TEMs） of automotive thermoelectric generator（ATEG） system along the exhaust flow direction, a flow-thermoelectric multi-physics field model was established with considering the exhaust flow and the temperature dependence of thermoelectric material properties. The influence of exhaust temperature and flowrate on the temperature distribution difference was analyzed, and the bench test of ATEG system was performed. The results show that the increasing of exhaust temperature can aggravate the temperature distribution difference between TEMs along exhaust flow direction. When the exhaust temperature is increased from 450 K to 600 K, the relative temperature distribution difference is increased by 105%. The increasing of exhaust flowrate is beneficial to reduce the temperature distribution difference, while the exhaust temperature is the main influence factor on the temperature distribution difference. The accuracy of the multi-physics field mathematical model can reach 97%.