Colorectal polyps are a type of abnormal growth of tissue that protrudes from the surface of the intestinal mucosa into the lumen of the intestine and are commonly referred to as polyps until the composition (pathological nature) is determined. Simply put, a polyp is a ball of flesh formed by the growth and aggregation of cells originating from the mucosa. 1, adenomatous polyps: including tubular, villous and mixed tubular (villous adenoma), such polyps have the highest probability of cancer, especially the villous, known as precancerous lesions. 2, inflammatory polyps: including polyps caused by chronic colitis, ulcerative colitis, Crohn’s disease and other inflammatory bowel diseases, also known as pseudopolyps. 3, misshapen type: juvenile polyps and pigmented polyp syndrome. 4.Proliferative polyps: the most common type of intestinal polyps, mostly distributed in the distal colon. No malignant change occurs. 5.Early childhood polyps: common in young children, round or oval in appearance, smooth surface. 90% grow within 25 cm from the anus, and most are less than 1 cm in diameter. These polyps generally do not undergo malignant transformation. Polyps that occur in the middle and lower rectum can be palpated by rectal examination, and those that cannot be palpated can be confirmed by sigmoidoscopy or colonoscopy. During colonoscopy, some polyp components are taken and analyzed by pathological examination to understand the nature, benignity and malignancy of polyps, i.e. biopsy.