Abstract: Emaciation is a common physical condition in clinical practice, often accompanied by symptoms related to "excessive fire in thin people". Insufficient yin-qi is the main physiological and pathological basis of emaciation, and excessive dryness-heat is the secondary manifestation. The disease involves five viscera, with the spleen as the core. The principle of treatment is to nourish yin-qi as the main method, and to dissipate stagnant heat as the auxiliary method. Specifically, it includes two aspects: treating the root cause and treating the symptoms. Treating the root cause should nourish yin-qi to improve the "emaciation" constitution, and treating the symptoms should dissipate stagnant heat to eliminate the "excessive fire" state. The importance of the two should be determined according to the severity and urgency of the excessive fire. Clinically, the addition and subtraction of medicinal ingredients are made according to factors such as the urgency of the root cause and symptoms, the state of emaciation and the ability to eat, the degree of deficiency or excess of fire-heat, the pathogenesis of the disease, and the season.