Enteroscopy when the discharge is clear water-like without fecal sludge indicates that the discharge is clean. Enteroscopy is able to directly observe the gastrointestinal tract lesions of the most direct, the most effective, the most commonly used methods, in the examination before the need to do a good job of intestinal preparation, fasting before the examination needs to be 6 to 8 hours, and in the examination before the feces should be emptied out of the intestinal tract, the need to take laxative defecation until the discharged material is watery and no fecal sludge until that indicates that it has been discharged cleanly. If the bowel is not adequately prepared, it will directly affect the doctor’s ability to observe the lesions in the bowel, which is not conducive to the diagnosis and treatment of the disease. Patients who need to undergo colonoscopy should prepare their gastrointestinal tract and actively cooperate with the doctor’s operation process.