In 2018, a bronze belt hook of the Warring States Period, inlaid with gold and turquoise, was unearthed from Tomb No.1 (M1) of Xigang Cemetery at the capital city site of Zhu State, Zoucheng City, Shandong Province. The belt hook was seriously corroded and in urgent need of conservation. Some information about the quality of the materials of the belt hook was acquired by means of X-Ray inspection, X-Ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS). In order to determine its artistic and scientific value, conservation work was carried out. In the process of conservation, it is found that the cross-sectional morphology of a gold wire is an inverted triangle or inverted trapezoid, and that a wider gold wire is formed through the bending and winding of a single narrower gold wire. These unique technological features have never been reported in previously published materials. This provides new valuable information for the study of ancient gold and silver-inlaying technologies.