Background: The firing techniques of producing underglaze copper red porcelain emerged in the Yuan dynasty and reached its maturity during the Ming and Qing Dynasties in Jingdezhen city.The technique of producing underglaze red porcelain was sensitive to the firing temperature and atmosphere

so it was very hard to produce and also difficult to display red color under the surface successfully.Purpose & Methods: The micro SR-XRF technique was employed to analysis a piece of sherd of underglaze copper red porcelain of early Ming dynasty.The Chemical compositions of glaze and color areas were presented

and the elemental contents in different color areas were obtained by using line-scanning techniques.Results: Some elements such as As and Pb were contained in raw materials

and the content of Cu had obviously increased with the color changing from gray to red.The results indicated that the nature mineral possibly used as the pigment for underglazed copper red porcelain coloration

and the color appearance also depends on the amount of copper in the pigments contained.Conclusions: This paper presents the advantage of the synchrotron radiation XRF technology and contributes to the science evidences for the Chinese ancient porcelain handcraft research.