According to the pathological characteristics, colorectal polyps are divided into neoplastic polyps and non-neoplastic polyps. The former are adenomas, which have the highest clinical incidence, including tubular adenomas, villous adenomas, and tubular villous adenomas, while the latter are commonly found in hyperplastic polyps and inflammatory polyps, etc. Adenomatous polyps are closely related to the development of colorectal cancer, and studies have shown that it takes about 7-12 years for adenomas to develop into invasive colon cancer. With the increase of adenoma, the proportion of villous component in adenoma gradually increases and atypical hyperplasia increases, thus villous adenoma is most likely to become cancerous, followed by tubular villous mixed adenoma and tubular adenoma. Although the cancer rate of non-neoplastic polyps is very low, they can develop into adenomas and further cancer. Therefore, once polyps are detected by colonoscopy, especially adenomatous polyps, they should be routinely biopsied and removed regardless of their size and location. It has been reported that the incidence of colon cancer is 76-90% lower in people who have colon polyps excluded or removed by colonoscopy compared with the general population.