Junkan, same as epilepsy of western medicine, has been reported on many oriental medical texts since Naegeong(內經). But It is very difficult for doctors to treat and manage Junkan(癲癎) patients because of the lack of literatural study and arrangement about the Junkan(癲癎). Therefor this study was performed in order to arrange the causes, classification, treatment methods and prognosis of Junkan(癲癎) and adapt to clinical therapy clearly. The results were summerised as follows. 1. The causes of Junkan(癲癎) were the heredity factor(胎病), Tamyeun(痰涎), heat(熱, 火), wind(風邪), seven emotion(七情), food poison(飮食傷) and so on. 2. Junkan(癲癎) was classified with five Jun(五癲) and five Kan(五癎) or Yun Kan(陰癎) and Yang Kan(陽癎) . 3. The methods of treatment, first of all, was vommitory treatment(吐法) in the case of Tam(痰) cause and next methods were relaxation(安神,寧神), sedation(平肝鎭驚), heat relief(淸熱降火), Tam remova(化痰) and so on according to the sympton. 4. The prognosis of Junkan(癲癎) was good in the case of intact shin(神不脫), Yang symptom(陽證), Bu disease(腑病) and Pyo disease(表病) and bad in the case of shin injury(神脫), Yum symptom(陰證), Jang disease(臟病) and Liu disease(裏病)