The correct way to drink electrolyte water before colonoscopy in the afternoon is to drink electrolyte water in the morning, followed by a little activity and rubbing the stomach. Before colonoscopy, you can arrange to drink the electrolyte water in the morning within half an hour, followed by appropriate activities, rubbing the stomach and observing the bowel movement, if the bowel movement starts, you can drink another 2,000 to 3,000 milliliters of water so that it will not lead to bloating and vomiting. Pay attention to observe the stool, if the discharged feces have fecal sludge, you can drink warm water again, no need to take medication, has been discharged like water, indicating that the intestinal tract is cleaned up, which is conducive to the smooth progress of the colonoscopy in the afternoon. Afternoon colonoscopy is recommended to take electrolyte water under the guidance of the physician, to do a good job of intestinal cleanup preparation, to do colonoscopy to provide a clear vision, is conducive to the diagnosis of the disease.