The most commonly used ancient prescription from ancient times to now is: Siwutang-the first prescription for enriching blood. Siwu decoction has the functions of promoting blood circulation, nourishing blood and enriching blood, and is good at nourishing yin and blood. It is an essential medicine for enriching blood, and it is one of the most widely accepted ancient prescriptions since ancient times. Siwutang is a traditional medicinal diet. It is made of four kinds of medicinal materials, namely Angelica sinensis, Ligusticum Chuanxiong, Radix Paeoniae Alba and Radix Rehmanniae Preparata. It is a classic medicated diet for enriching blood and nourishing blood in traditional Chinese medicine. The prescription of Siwutang was first recorded in the Secret Recipe of Immortal Therapy for Wounds and Dipsacs written by Lin Daoren in the Tang Dynasty, and the widely used prescription was taken from the record of Taiping Huimin Mixture Bureau Prescription.