Yamada type 1 intestinal polyp is a benign polyp that occurs on the mucosa of the colon. The Yamada classification of colon polyps is a way of distinguishing the type of polyp proposed by Dr. Yamada, a Japanese professor. There are four main types of polyps in the Yamada classification. The later the type, the higher the chance of malignancy. Yamada type 1 is a small flat bulge in the colonic mucosa, which is usually similar in color to the surrounding normal intestinal mucosa, and can easily be missed if too much gas is injected during colonoscopy. The pathology of this type of polyp after biopsy suggests more hyperplastic polyps. Colonoscopy found Yamada 1 type of polyps, can be regular follow-up observation, can also be given to a one-time biopsy forceps removal clear pathology, if slightly larger polyps, can also be used to endoscopic treatment, such as argon ion coagulation or endoscopic mucosal resection to treat.