We all know that colonoscopy requires preoperative bowel preparation. When a colorectal polyp is found and minimally invasive endoscopic surgery for colorectal polyps is required, bowel preparation is also required and should be better than during the examination. How to prepare the intestine before surgery? 1, 2 days before surgery to control the diet, to no residue diet, avoid any vegetables, fruits (including fish, eggs, meat); to white rice thin rice or rotten noodle soup, which can add sugar or salt, can not add salty vegetables, beans food. Millet or black rice thin rice is not easy to digest, there are colors can not be eaten. 2.The night before surgery, milk and lotus root powder are the main ingredients. 3, the night before surgery about 9 pm, oral laxatives (laxatives can not use mannitol), divided before 12 pm finished. after 12 pm can be appropriate amount of light salt water. If the next day to perform anesthesia enteroscopic surgery, after 4:00 pm can not drink water. 4, patients with a history of constipation, two days before the operation can be applied laxative, such as 20 grams of senna leaves for tea, marijuana capsules, etc.. Properly control the diet for a few more days. 5, patients with a history of oral anticoagulant drugs should stop taking them 1-2 weeks before surgery.