Red peony is bitter in taste and cool in nature, with the effect of resolving blood stasis and relieving pain, cooling the blood and eliminating swelling, so it is mainly used for clinical manifestations of symptoms such as blood under the intestinal wind, irregular menstruation, spontaneous sweating, night sweating, red eyes and swelling pain, abdominal pain, rib pain, etc.; while white peony mainly has the effect of nourishing blood and softening the liver, relieving pain, astringing yin and collecting sweat, and is used for treating pain in the internal oblique of the chest and abdomen, diarrhea and dysentery, abdominal pain, spontaneous sweating, night sweating, yin deficiency and fever, irregular menstruation, and collapse. Therefore, it is used for dilating coronary arteries and lowering blood pressure of cardiovascular and cerebrovascular, and has the effect of anti-thrombosis and anti-platelet coagulation. It is good for antispasmodic effect mainly for gastrointestinal spasm of intestinal tube parts, as well as against uterine contraction caused by oxytocin, and has analgesic and antispasmodic effect for heat reaction or high fever convulsions caused by body.