Abstract:Metallographic examination and composition analysis of metal wire dated from the early West Zhou Dynasty excavated from Xiezidi site in Daye city, Hubei Province, were performed by X ray fluorescence spectrometer and metallographic microscope, and compared with findings related to solders attached to ancient bronzes and modern Sn-Pb eutectic solder. The results show that the metal wire is of Sn-Pb alloy with melting point of ~200 ℃ which is significant parallel with modern Sn-Pb eutectic solder. The metal wire is not supposed to be ingredient of bronze casting but is very likely to be related to bronze welding. However, the real function of the metal wire will be confirmed by new discoveries related to archaeology and scientific research.