The incidence and mortality of colorectal cancer in China are increasing year by year, and it could be effectively curbed by early prevention, screening, diagnosis and treatment. Colonoscopy is one of the most important means to screen and detect colorectal cancer. The adenoma detection rate is a key quality control index for colonoscopy. Improving the adenoma detection rate can not only improve the quality of colonoscopy, but also significantly reduce the incidence and mortality of colorectal cancer, which is of great clinical significance. Our team explores several ways to improve the adenoma detection rate from different levels such as bowel preparation quality, operation skills of entering endoscopy, time and quality of exiting endoscopy, and artificial intelligence system, so as to lay a solid foundation for endoscopists at the colonoscopy learning stage, effectively improving the low adenoma detection rate during colonoscopy in our country.