Study on the Effect of Individualized Video Guidance on Improving the Quality of Intestinal Preparation of Patients Undergoing Colorectal Endoscopy

Interventions: guidance with Video :Watch the video guide of bowel preparation; guidance with Short message:Use SMS to guide patients or their families in bowel preparation.;guidance with Paper information:Use Paper information to guide patients or their families in bowel preparation.
Primary outcome(s): Cecal intubation rate;Detection rate of adenoma
Study Design: Parallel