Cao Wu is an expectorant of wind-dampness and is the dried root of Aconite, clinically similar to Chuan Wu in its efficacy, but more toxic than Chuan Wu. The medicinal properties are characterized as pungent, bitter, hot, and highly toxic, and the efficacy is to dispel wind-dampness, warm the menstruation and relieve pain. Clinical role has the following aspects: 1, used for wind-cold-dampness paralysis, Cao Wu pungent dispersal, warm through, bitter and dry, so it can dispel wind-dampness, warm menstruation, cold, pain. Clinically used to treat wind-cold and dampness evil attack on the human body caused by joint pain, flexion and extension of unfavorable. Cao Wu is often used in conjunction with Qiang Duhu, Gentiana Macrophyllae, Epimedium, Bacopa monnieri and other wind-dampness medicines; 2. Cao Wu can treat cold pain in the epigastric region or cold hernia and abdominal pain caused by coldness within the Yin, which can be seen as heart-abdominal pain, cold pain in the back, or pain in the back and the chest, and so on. Cao Wu can be used together with Cinnamon and Radix et Rhizoma Polygoni Multiflori; 3. Cao Wu can be used in the treatment of bruises and anesthesia to relieve pain.