Abstract: Due to the inherent Iimitation of the traditionaI methods to measure Iining erosion state of reaction tower of copper fIash furnace, a new non-contacting reaI-time monitor method and corresponding anaIysis and diagnostic system are provided in this paper. The principIe of this method is that the Iining erosion is estimated by means of the surface temperature changes of the reaction tower, which the temperature changes are detected with the infrared nod temperature instrument. It is emphaticaIIy discussed how to impIement seriaI communication with muIti-thread. It is testified through the experiment that this method is feasibIe and corresponding detect and diagnostic system can be buiIt easiIy and economicaIIy