Exogenous fever disease is a kind of disease that induced by six pathogenic factors and epidemic toxin. BAI Changchuan makes a comprehensive study of Treatise on Epidemic Febrile Diseases（ 《温热论》） and Treatise on Febrile Diseases（ 《伤寒论》） theories

and applies it into the treatment of exogenous fever

and puts forward four therapeutic methods of "sweating"

"dispersing"

"purging"and "preventing". Sweating method can be used to release the exterior and clear the heat

and to treat warm-heat disease and cold pathogenic disease

usually be applied with Herba Ephedrae. Dispersing method with Gypsum Fibrosum and Herba Ephedrae can resolve constraint and clear heat and treat warm-heat disease and cold pathogenic disease. Purging method can be used to dispel pathogen out of body and to discharge the upper

middle and lower jiao. Preventing method was used to prevent the transformation and development of diseases

including preventing warm-heat disease in qi and preventing cold pathogenic disease in shaoyang.