In this paper, the secondary color of Myanmar jade has been studied by using first order derivative UV spectrophotometry. The results showed that red or yellow fog zone changes only from the blue fog zone. The change of red or yellow fog from blue fog is resulted from the transformation from chlorite into hematite. The fog zone of jade presents yellow color when it contains goethite, and it presents bleeding red when containing very small quantity of hematite. Compared to the heated red jade with the same red coloration degree, the natural red jade shows mainly the wavelength of goethite, but the heated red jade show mainly the wavelength of hematite, which may be a basis for their identification.