Since 4 different ratio Danggui Buxue Tang have different pharmacological effects, the components or the contents of the components should not be the same. The paper aims at two purposes. The one is to compare each ingredient between every Danggui Buxue Tang, and in the same time between Danggui Buxue Tang and the herbs they comprise: Radix Angelica sinensis, Radix Astragali. The other one is tying to find if contents of the ingredients change with Radix Angelica sinensis's dosage regularly.The samples are ...