Abstract: Seventeen fossil bones and teeth of mammals from the deposits of Hexian and Chaoxian, Anhui Province, where human skull, teeth and occipital bone were found, were dated with uranium series dating method. The closed system of these samples was tested. This paper gives the age ranges of 150-190 ka and 160-200 ka for Hexian and Chaoxian fossil human sites respectively. But it can not be excluded that samples (especially, the samples from Chaoxiany with an older age (less than 270 ka) might exist in the lower parts of these deposits.

Key words: Uranium series dating; Fossil human sites; Hexian; Chaoxian