(i) Non-surgical treatment: The principle is to release the spasm of sphincter, relieve pain, help defecation, interrupt the vicious cycle and promote local healing. 1.Change bad bowel habits and have regular bowel movements. 2.Keep the stool open: increase drinking water and multi-fiber food, such as fresh fruits, vegetables, beans, pasta, etc. For those with normal blood sugar, drink a small amount of honey every night. If necessary, with laxatives (compound aloe vera capsules, fruit guide, senna, etc.) or paraffin oil to make the stool loose and lubricated. 3, maintain local cleanliness: 1: 5000 potassium permanganate sitz bath after defecation, the warm environment is also conducive to anal sphincter relaxation, can relieve pain. 4.Anal dilation therapy: dilation after local anesthesia, maintained for 5 minutes, can release the sphincter spasm, expand and establish fresh trauma, and promote fissure healing. (ii) Surgical treatment: applicable to those who do not heal for a long time, non-surgical treatment is ineffective, and the symptoms are more serious. 1.Anal fissure excision: that is, removal of all fissure edges, anterior sentinel hemorrhoids, hypertrophied anal papillae, inflamed crypt and deep unhealthy tissues. 2.Severance of the internal sphincter of the anal canal: the spasmodic contraction of the internal sphincter of the anal canal is the main cause of anal fissure pain. Cutting off part of the internal sphincter can relieve post-surgical pain and promote healing.