This paper presents the results of the analysis of lead isotopes and trace elements carried out on the samples from a group of painted bronze waterfowls unearthed from Emperor Qinshihuang's Mausoleum Site Park. The analytical results are compared with the lead isotope and trace elements data on related bronzes and copper ores. The compared bronzes include early Qin cultural bronzes unearthed from the eastern part of Gansu province and the western part of Shaanxi province, bronze objects unearthed from Yu state cemetery and the Lijia bronze foundries in Baoji. The copper ores used for comparison include ancient copper ores from Zhongtiaoshan mountain in Shanxi province, Ruichang and Tongling in Jiangxi province, Tongling in Anhui province, Dayetonglvshan in Hubei province and modern copper ores from different mines in Qinling mountain. The results show that similar copper ores were used for all the 46 bronze waterfowls and most of the early Qin cultural bronzes, but that these were different from the western Zhou bronzes unearthed from Yu state cemetery and the Lijia bronze foundries in Baoji. The lead isotope profiles of copper ore used for bronze waterfowls and early Qin cultural bronzes are similar to those of modern copper ores in the Qinling Mountains.