A research was carried out to test three cases about the installation position of the thermoelectric generator. In case 2, the heat exchanger obtained a relatively high surface temperature and an ideal temperature uniformity to improve the efficiency of the TEG. The pressure drop of CC, muf and heat exchanger was relatively low, which met the requirement of the exhaust gas system. At the same time, the CC and muf in case 2 can keep normal working. So case 2 is the best.