Accurate temperature control is the key to measuring the temperature coefficient of metal resistance．Based on a temperature control device composed of PTC heating plate，micro-controller，temperature sensor，metal cavity，etc．，to achieve heating，temperature control，and temperature measurement of enameled copper wire．The improved experimental device has accurate temperature control，good linearity of experimental data．Linear correlation coefficient Ｒ 2 is over 0．999，and the measurement result is much closer to the theoretical value．