They mainly include: 1. spastic pain of the internal anal sphincter; 2. pain due to postoperative skin edema, local tissue edema, impaired microcirculation, and reduced blood supply to nerve endings, forming ischemic neuralgia[1] . The main factors for its triggering are: 1. unsatisfactory anesthesia; postoperative anal pain 2. excessive patient tension and hypersensitivity to pain; Zhang She-sheng, Department of Anorectal Medicine, Yangzhou Hospital of Traditional Chinese Medicine 3. different degrees of surgical stimulation injury; 4. postoperative perianal edema or local infection; 5. stimulation by trauma exposure admissibility factors; 6. anal sphincter spasm; 7. postoperative trauma scar compression of nerves. The pathological basis is tissue nerve damage during surgery, inflammatory mediator release, and increased central excitatory reactivity, resulting in nociceptive hypersensitivity [2, 3, 4], so postoperative pain in anal diseases often lasts longer, as reported by Zhou Shunchang et al [5], compound methylene blue injection has both the fast-acting local anesthetic effect of lidocaine and an extremely pronounced prolongation of local analgesia. Methylene blue is an alkaline stain with strong affinity for nerve tissue, which can corrode the nerve fiber medulla and produce reversible damage to reduce or disappear local pain, and this damage generally lasts for about 15 days to meet the incision growth requirements. However, the drug has a burning pain reaction in the first 2-3h, a certain concentration of methylene blue can fully infiltrate the trauma, the surrounding tissue after increasing the dosage will generally not increase the pain relief effect but will increase the side effects, so we commonly use methylene blue plus bupivacaine and lidocaine without anesthesia gap, obviously reducing the degree and duration of postoperative pain in patients, while effectively reducing the pain due to postoperative anal The reflex urinary difficulty and anal sphincter spasm caused by postoperative anal pain were reduced, and the patient’s pain was alleviated. According to traditional Chinese medicine, the mechanism of pain is localized stagnation of qi and blood in the body, which leads to obstruction and pain. In this formula, Scutellaria baicalensis, Phellodendron cypress and Rhubarb can clear heat and detoxify, dry dampness and astringency, and inhibit bacterial growth; Radix Paeonia lactiflora, Chuan Cao Wu, Angelica dahurica and Bletilla can resolve blood stasis and relieve pain, promote the growth of meat teeth and epithelial tissues, and reduce pain and edema. Modern medical research concluded that Scutellaria baicalensis, Radix et Rhizoma cyperus, Radix et Rhizoma rhizoma, Radix et Rhizoma Paeoniae, Radix Chuan Cao Wu, Radix Angelicae dahuricae, Radix et Rhizoma splendens used in this formula have the effects of reducing capillary permeability, increasing platelets and preventing exudation, especially in improving the metabolism of ischemic tissues and scavenging free radicals, preventing the occurrence of ischemia-reperfusion injury, thus achieving the purpose of reducing postoperative swelling and pain. In conclusion, the combination of compound methylene blue injection and Chinese herbal fumigation bath can promote blood circulation and lymphatic reflux, improve the metabolism of ischemic tissues, scavenge free radicals, reduce swelling, reduce or even eliminate pain, promote wound healing and shorten the course of disease, and is simple to operate and easy to promote.