With the popularization of digestive endoscopy in children, colonoscopy has been widely used. As the basis of digestive endoscopy, bowel preparation directly affects the diagnosis and treatment results of colonoscopy. Compared with adults, the function of the important organs of children is not mature, and their ability of cognition, communication and tolerance are weak. Their structure of the digestive tract is also significantly different in different ages. However, there are no existing evidence-based guidelines on bowel preparation for digestive endoscopy of Chinese children. Therefore, it is important to develop evidence-based guidelines for bowel preparation combined with the clinical practice in China. In order to provide guidance and decision-making basis for Chinese pediatricians, we collaborated with multidisciplinary experts, based on existing evidence, adopted the grading of recommendations assessment, development and evaluation (GRADE) approach, and followed the Reporting Items for Practice Guidelines in Healthcare (RIGHT) to develop this guideline for bowel preparation related to the diagnosis and treatment of children's digestive endoscopy.