In our review, the conclusions on the concept and principle of perspiration are as follows. 1. It is the physiological perspiration that Qingyang(淸陽) from Jing(精), Qi(氣), Xie(血) synthesized by digestion of food and drink(水穀), is increased and secreted from pores on the skin(?理). 2. The main center to control perspiration is heart(心), but lver(肝), stomach(胃), spleen(脾), lung(肺), bladder(膀胱), kidney(腎) and triple energizer(三焦) can be also related to perspiration indirectly. 3. As Weiqi(衛氣) make the body warm and keep the body temperature constant by controlling perspiration, it is very important to make a diagnosis of Weiqi(衛氣) Xushi(虛實) by skin temperature. 4. We guess that perspiration can be secreted by the control of BiaoLi-YinYang(表裏陰陽) such as centrifugal(氣) and centrifetal force(形) of Qi(氣). 5. Sweating therapy can make the level of Biaoyang(表陽) correct and control the balance between centrifugal(氣) and centrifetal force(形) of Qi(氣).