Modern use of Angelica Sinensis Si-Yi Tang: Decoction with water. The ancient practice of Angelica Sinensis Si Reverse Tang is to boil eight liters of water to make three liters, remove the dregs, and take one liter of the medicine warmly three times a day, and the modern practice is to be prescribed by a professional physician, and take the medicine by decoction according to the commonly used decoction method after catching the medicine. It is mainly used in treating blood deficiency and cold syncope syndrome (blood deficiency in the body and cold in the meridians, resulting in cold hands and feet), which is characterized by cold hands and feet, or pain in the shoulder, arm, waist, femur, leg and foot, no thirst in the mouth, and a pale tongue with white coating. In this formula, Angelica sinensis can nourish blood and blood to nourish the deficiency; Gui Zhi can warm menstruation and dissipate cold to open the veins; Paeonia lactiflora can nourish blood and ying (harmonize the ying part of the blood); Xin Xin warms the menstruation and dissipates cold to enhance the effect of warming and opening the menstruation with Gui Zhi; Tong Cao can promote blood circulation by opening the menstruation; and Roasted Licorice and Jujubae can benefit the vital energy and strengthen the spleen to nourish blood to nourish deficiency. The combination of these herbs is effective in warming menstruation, dispersing cold, nourishing blood and promoting blood circulation. Before taking Angelica Si-Yi Tang, one should consult a traditional Chinese medicine practitioner for diagnosis and use it under the guidance of a doctor, rather than using it blindly.