Semen astragali complanati Extract is extracted from Semen Astragali Complanati, the dried ripe seed of Flatstem Milkvetch (Astragalus complanatus Bunge) (Leguminosae). The major contents of Semen astragali complanati include fatty acids, amino acids, polysaccharides, flavonoids, triterpene glycosides and trace elements. Semen astragali complanati exhibits a number of therapeutic effects on chronic diseases such as cardiovascular diseases, diabetes mellitus and cancers.