Effect in reducing weight of aromatic leptin has been proved by a lot of clinical test. Aromatic leptin may affect the behavior of people. Aromatic leptin stimulates brain full bilge central generate full bilge signal through suppress appetite, break many kinds of mechanism of conditional reflex between the fragrance and food, play the role of weight loss. Aromatic leptin the effect in reducing weight mechanism may be the result of many kinds of ways composite effect, at different time, in different environment, different mechanism play the role.