Unani system of medicine was originated from Greece. It is a form of traditional medicine practiced in middle east & south asian countries. Hippocrote (460- 370 BC) taught first time about Unani medicine. In India Unani system of medicine was introduced by Arabs.An outstanding physician Hakim Ajmal Khan (1868-1927) gave indispensible contribution to Unani System in india & initiated systematic research in the field of Unani medicine. Unani system of medicine infact is the “SCIENCE OF LIFE” provide practical knowledge about function & structure of Human Physiology, the cause of disease and the action of herbal drugs.