Elements containing information of the mother lode and concentrated in copper after smelting of copper ore can be used to deduce the source of materials in bronze .In order to study the provenance of copper minerals, the trace elements of 21 bronzes excavated from the ancient city of Zheng and Han in the Eastern Zhou Dynasty are analyzed using Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES). The analytical results showed that the compositions of the trace elements in the bronzes are relatively uniform, and from this it could be inferred that the ores are from the same or similar mining sites. There are some remarkable differences between the traces elements identified in objects from ancient capital city of Zheng and Han and those from the Xiaoshuangqiao site. This illustrates that the ores chosen for casting changed between the middle-Shang and Spring and Autumn periods in this area. The results of the study can provide clues to the mineral provenance of bronzes.