Madagascar is now the most important origin of sapphire all over the world. Aiming to analyze the coloration mechanism with ultraviolet-visible absorption spectrum and X-ray fluorescence (XRF) and to explore the heat treatment process of low quality sapphires from Madagascar, the sapphire samples are treated at 1300 ℃~ 1600 ℃ for 12~20 h in the air, most of the samples become light ones with weaker Fe2+/Ti4+ charge transfer, and some samples show fine color in blue with the decline of Fe3+ and increase of Ti4+.