In Chinese medicine, there are many herbs with similar names but very different efficacy, clinical applications are also very different, Mu Xiang is one of them. At present, the market has a wide range of mucuna pruriens, cloud mucuna pruriens, Sichuan mucuna pruriens, earth mucuna pruriens, green mucuna pruriens, white mucuna pruriens and other different, these mucuna pruriens sources, quality, price, etc. also have a great difference, in order to ensure the safety of clinical use of drugs, effective, now from the following aspects to distinguish. First, from the source. Guang Mu Xiang and Yun Mu Xiang, the dried roots of Mu Xiang, a plant of the family Asteraceae. The origin of the root is India and Burma, and it was imported from Guangzhou, called “Guang Mu Xiang”. It was introduced to Yunnan in the 1930s, and was known as “Yun Mu Xiang” because of its superior quality and origin in Yunnan. Chuan Mu Xiang is the dried roots of Chuan Mu Xiang or gray hair Chuan Mu Xiang, mainly produced in Sichuan, Tibet and other places; Tu Mu Xiang is the dried roots of Tu Mu Xiang, mainly produced in Hebei; Qing Mu Xiang is the dried roots of Aristolochia or Northern Aristolochia; Bai Mu Xiang is the dried wood of Bai Mu Xiang without resin, often not used for medicinal purposes. Secondly, from the viewpoint of traits. Guangmu Xiang and Yunmu Xiang are cylindrical or semi-cylindrical. Surface yellow-brown to gray-brown, with obvious wrinkles, longitudinal grooves and lateral root traces. The texture is firm, not easy to break, the cross section gray-brown to dark brown, surrounding gray-yellow or light brown-yellow, forming a layer of ring brown, with radial texture and scattered brown dotted oil chamber. The aroma is peculiar, and the taste is slightly bitter. Chuan Mu Xiang is cylindrical or semi-cylindrical with longitudinal grooves, slightly curved. The surface is yellowish brown or brownish brown, with wrinkled longitudinal lines, loofah-like veins can be seen where the outer skin falls off; the root head occasionally has a black sticky gelatinous material, customarily called “oil head”. The body is light, hard and brittle, easy to break, yellow-white or yellow cross-section, with dark yellow sparse oil spots and fissures, wide wood, with radial texture; some centers are withered and rotten. Smell slightly fragrant, taste bitter, chewing sticky teeth. The wood is conical in shape, slightly curved. Surface yellowish brown or dark brown, with longitudinal wrinkles and fibrous root traces. The root head is thick, with a sunken stem scar and leaf sheath stump at the top, surrounded by cylindrical branch roots. The texture is hard, not easy to break, slightly flat in section, yellowish white to light grayish yellow, with concave dot-like oil chamber. Smell slightly fragrant, taste bitter, pungent. Green mullein is cylindrical or flat cylindrical, slightly curved. Surface yellow-brown or gray-brown, rough and uneven, with longitudinal wrinkles and fibrous root traces. The texture is brittle, easy to break, the section is not flat, the skin part is yellowish, the wood part is wide, the rays are white, radially arranged, forming a layer ring obvious, yellowish brown. The aroma is peculiar, bitter taste. White incense and incense from the same plant, also known as white wood incense, incense from the heartwood containing resin, while white incense from the wood without resin, mostly refers to the sapwood. Most of the white wood incense on the market is made artificially, using natural fungi to invade the trunk or burns with wire drilling, fire baking, so that the resin oozes out, and there are also made with autoclaves, steam pots dipped in oil. White wood incense in high-temperature boiling water, soaking oil things easy to white, the taste is very strange, no natural incense that natural aromatic smell, but with alcohol taste of strange fragrance. Once again, from the point of view of the function of the main treatment. Guang Mu Xiang, Yun Mu Xiang, pungent, bitter, warm. It belongs to the spleen, stomach, large intestine, Sanjiao and bile meridians. It has the effect of moving qi and relieving pain, strengthening the spleen and eliminating food, and is mostly used for chest and epigastric distension and pain, diarrhea and dysentery, food stagnation, not thinking about eating and drinking, etc. Chuan Mu Xiang is a good remedy for pain relief, and can also warm the middle and stomach. It is used for treating pain in the abdomen and stomach, vomiting, diarrhea, dysentery, dysgeusia, and pain in the liver and gallbladder. It is used for pain in the chest and abdomen, vomiting, diarrhea, contusion in the chest, forked gas and pain, and fetal restlessness. Qing Mu Xiang, pungent, bitter, cold. It belongs to the lung and stomach meridians. It has the function of calming the liver and relieving pain, detoxifying and eliminating swelling, and is often used for dizziness and headache, chest and abdominal distension, carbuncles and furuncles, snake and insect bites. White mullein does not contain resin, almost no medicinal value, often used as raw materials for jewelry.