The correct name of Owed Grass is Cynanchum officinale, which is a kind of Chinese herb that removes blood stasis and stops bleeding. It is the dried root and rhizome of Cynanchum sativum, family Cynanchaceae, with bitter taste and cold nature, and belongs to the liver meridian, which has the effect of cooling blood, removing blood stasis, stopping bleeding, and clearing the meridians and collaterals. It is mainly used in the treatment of blood-heat hemorrhage, especially for bleeding caused by blood-heat and stagnation. It can also be used to treat amenorrhea caused by blood stasis, bruises, and joint pain caused by meridian stasis. The herb can be decocted into soup or used externally in appropriate quantities. When used to stop bleeding, it is usually stir-fried with charcoal, and when used to invigorate blood circulation and promote menstruation, it is usually used raw or stir-fried with wine. Adverse effects and contraindications of Cynanchum are still unclear, pregnant women should be cautious of using the drug. Cynanchum should be used under the guidance of a professional physician to identify the evidence, and should not be taken without authorization.