Xinzhai is an important archaeological site discovered 40 yr ago and recently re-excavated in the Henan Province, China. It is believed that the cultural characteristics of the Xinzhai site correspond to the Xia dynasty, the first ancient dynasty of China. Radiocarbon measurements on bone samples from this site were performed at the Peking University AMS facility (PKU-AMS) and the Vienna University AMS facility (VERA). Calibrated ages were obtained with the computer program OxCal. The results of these measurements are presented and the related chronology is discussed.