Abstract: Trace elements and heavy elements in three individual bones from Chongtang neolithic site Guangai were investigated with AAS. The main results are as follows.
The high content (124.64 ppm) of Sr and the observed ratio (0.368) imply that the foods of Chongtang neolithic people were mainly from vegetable. Considering a lot of shell fossils in the site we think that the cause of high content of Zn in the bones relates with shells which are the main protein food for the neolithic people.
The low content of Cd and Pb indicates that the neolithic people lived in primitive natural environment.

Key words: Trace element; Neolithic Age; Chongtang