The precautions for colonoscopy in children are to eat a liquid diet the day before the colonoscopy, to fast on the day, to take laxatives or to perform an enema. Currently the most used is the electronic colonoscopy, the most important thing before colonoscopy is the bowel preparation, the purpose is all to clean the bowel without affecting the view of the examination. Three days before performing a colonoscopy, you should eat easily digestible food, preferably a liquid diet the day before. It is usually recommended that no more food is eaten at around 22:00 the night before the test. If children can cooperate, they will need to take a laxative in the evening, and younger children will need to have a cleansing enema given by a nurse before the test until the stool appears yellow or watery before the colonoscopy is performed. If children often have intestinal symptoms, it is recommended to go to a regular hospital in time to clarify the cause of the disease, and then carry out targeted treatment under the guidance of the doctor.