Drinking electrolyte water before colonoscopy generally refers to drinking polyethylene glycol electrolyte bulk aqueous solution, and the correct way to drink the medicine includes dietary preparation before drinking, taking the medicine in divided doses, and proper exercise, etc., as follows. 1. Dietary preparation: the day before drinking polyethylene glycol electrolyte bulk aqueous solution, it is recommended to eat soup, porridge, egg custard and other diet with less residue, 3 to 4 hours before taking the medicine, it is best not to eat solid food and more residue food. 2. Split dose: Before enteroscopy, it is usually necessary to dissolve the electrolyte bulk in the right amount of water, and then take the mixed solution in small portions to reduce the discomfort of drinking a large amount of laxatives. If the effect is not good, you can also drink more water. 3. Appropriate exercise: when drinking polyethylene glycol electrolyte bulk aqueous solution, you can exercise appropriately to promote intestinal peristalsis, which is conducive to defecation. 4. Observe the stool situation: after drinking the aqueous solution of polyethylene glycol electrolyte dispersions will promote defecation, at this time, you need to observe the stool situation until it becomes clear water-like, then it is considered to be the bowel preparation is complete. Drinking polyethylene glycol electrolyte bulk aqueous solution before colonoscopy should be taken according to the doctor’s instructions. If nausea, vomiting, unclean stools and other symptoms occur in the process of drinking the medicine, it is necessary to inform the doctor in a timely manner, and enemas and other medicines can be used to remedy the situation, in order to achieve the best effect of intestinal preparation.