Anal fissure bleeding due to constipation is often caused by dry stools, resulting in edema, congestion and erosion of the mucous membrane at the anal opening. In this case: first, pay attention to the usual diet, as far as possible, based on light food, less fried, greasy, spicy stimulating food. Secondly, give symptomatic treatment with medications, such as lactulose oral solution, bifidobacterium capsules, compound polyethylene glycol electrolyte dispersion, and fruit guide tablets, which can effectively solve the constipation and help improve the function of the stomach and intestines, softening the stool and reducing the stimulation of anal fissures. Finally, you can appropriately give the open plug, because it can effectively lubricate the intestine, can improve the function of the intestine, and play a role in solving constipation. For heavy bleeding, Yunnan Baiyao can be given orally, which can effectively stop the bleeding. If the bleeding is still not relieved, it is necessary to give symptomatic treatment with compound cornic acid ester suppositories or indomethacin suppositories.