Normally, you can drink about 2000ml to get rid of the intestinal contents. Those with poorer bowel function may need to drink around 3500ml to drain the contents. How much electrolyte water to drink for colonoscopy needs to be done according to your own situation and doctor’s advice. In general, in order to colonoscopy more clear, more accurate, usually need to do colonoscopy before taking drugs to promote excretion, the more common pro-excretion drugs are mainly polyethylene glycol electrolyte dispersions, general 68.56g of electrolyte powder rinse with at least 1,000ml of water. In the clinical examination of enteroscopy before drinking the electrolyte powder to drink at least 137.12g, divided into doses, drink about 2000ml can be drained intestinal contents, if the intestinal function is not good, about need to drink 3500ml of electrolyte water in order to drain the contents of the net. When drinking, pay attention to appropriate activities and abdominal massage to promote rapid defecation, if the stool is watery and no obvious food residue, it is not necessary to achieve the specified specific amount, as long as it can ensure the cleanliness of the clinic in doing colonoscopy, to avoid affecting the results of colonoscopy.