加工西洋参(American ginseng)以制备美国黑人参(American black ginseng)的方法包括:1)清洗生长3～7年的西洋参;2)在30～70℃干燥12～36h;3)除预加热时间外,在60～120℃下蒸1～5 h;4)于40～80℃下干燥6～18 h。将步骤3)、4)重复9遍,即得含水量小于14%的美国黑人参。也可用以下方法制备:1)清洗生长3～7年的西 The method of processing American ginseng to prepare American black ginseng includes: 1) washing American ginseng growing for 3-7 years; 2) drying at 30-70° C. for 12-36 h; 3) except preheating time , steaming at 60-120°C for 1-5 h; 4) drying at 40-80°C for 6-18 h. Repeat steps 9) and 4) 9 times to obtain African American ginseng with water content less than 14%. It can also be prepared by the following methods: 1) Cleaning and growth of 3 to 7 years in the West