Chinese medicine believes that qi and blood are closely related. "Tangible blood cannot be born by itself, but by invisible qi", thus putting forward the argument that "qi can produce blood". Therefore, replenishing blood must replenish qi. In addition, the curative effect of blood-enriching drugs depends on the function of spleen and stomach. Therefore, Danggui Buxue Decoction uses Danggui Buxue and Huangqi Buxue Shengxue, which is the reason.