Abstract: The age of Yuanmou Man has been dated at 1.7 +0.1 Ma.Bp. by palaeomagnetic method.
This paper is the first study of the age of Yuanmou Man by the method of amino acid.The samples were the fossil teeth-Sus sp. and Cervus sp. analysed by gas chromatographicmethod. They contain Ala. Val. Gly. D-allo-leu.L-iso-leu. Leu, Ser. Pro. Asp. Met. Phe. Glu.D-9-phe. Tyr. Lys. Arg. His. Try. They are dated at 1.54 Ma.BP..

Key words: Yuanmou Man; The method of dating by amino acid racemization