Abstract: In order to study which part of jadeite from Myanmar can be used to do a red－hot processing and explain why it can be used to do a red－hot processing，this paper investigates the characteristics of heating of jadeite from Myanmar by using the thermogravimetric and thermal analysis（TG－DSC），polarizing microscope and infrared spectrum （IR）.The results show that the origin zone of this type of jadeite cannot be turned red at a low temperature 400℃，while its fog zone can be turned red at this low temperature.In this process，the blue fog can be heated to yellow and red，and the yellow fog can be heated to red.The reason of this transformation is that a great amount of Fe^2＋in chlorite is oxidized to form into Fe^3＋at a low temperature，making the blue fog zone turn to yellow，while Fe^2＋in jadeite is so less and needs to be heated a more higher temperature that can make it be oxidized to Fe^3＋，which will damage the lattice of jadeite.