Black ginger originated from Thailand and Laos, etc. The local people used it as a traditional medicinal material since antiquity. Due to the special tast, it is used as a spice in daily life too. Black ginger has a high medical value. Black ginger extract has many physiologic functions and efficacies, such as lowering blood lipid, lowering blood pressure, softening blood vessel, preventing myocardial infarction, prevention and treatment of cholecysitis and gallstones, relieving and eliminating stomachache suffered from gastroduodenul ulcer, treatment of common cold, lowering weigh and eliminating "senile plaque". It also possesses a special efficacy of relieving seasick and carsick.