Anal fissures are one of the more painful types of anal disease and can be associated with many anal discomforts. Therefore, the prevention of anal fissures should be emphasized. Prevention: 1. Drink less alcohol, do not eat spicy and stimulating food, do not eat too fine, mix coarse and fine grains, and consume as much fiber-rich food such as vegetables as possible to keep the stool normal. 2, to keep the stool smooth, to develop the habit of regular bowel movements every day, found when the stool is dry, do not blame the bowel movement, but to use warm salt water enema or open cork injection anal laxative. 3, with the anal speculum for examination, do not use the speculum rough operation, damage the anal canal. When making anorectal diagnosis, avoid rough force to avoid damage to the anal canal. 4.Treat various diseases that cause anal fissures, such as ulcerative colitis, in a timely manner to prevent anal fissures from occurring. 5.For those who suffer from anal fossa inflammation and anal papillitis, cure them as early as possible to prevent the formation of ulcers and subcutaneous fistulas after infection, which may induce anal fissures. 6.For those who have anal canal skin damage, they should be treated actively to prevent the formation of ulcers due to infection. 7. Those with perianal eczema, dermatitis and itching should be treated actively to prevent the perianal skin from hardening and weakening of elasticity and tearing of the anal canal skin.