Inclusion Criteria:Patients ≥18 years of age undergoing screening, follow-up monitoring, and diagnostic colonoscopy -  Exclusion Criteria:①Cecal intubation failed. ②Have a history of colorectal surgery. ③Insufficient bowel preparation, Boston Bowel Preparation Score (BBPS) <6 points. ④Inflammatory bowel disease or intestinal tuberculosis. ⑤Familial polyp syndrome. ⑥Recovery of polyp specimens failed, and no histopathological data. ⑦Patients with coagulation dysfunction.  -