Colon polyps 0.4cm can be removed by colonoscopic complete tumor resection, endoscopic mucosal resection, cold loop polypectomy and other resection methods. 1. Endoscopic complete tumor resection: colon polyps 0.4cm mostly used in this way, it is simple, effective, less painful, short treatment time. The colonoscope is used to reach into the morbid part of the body, and under visualization, the root of the polyp is ligated, and then the polyp is resected by electrocautery or laser cauterization. 2. Endoscopic mucosal resection: endoscopic mucosal resection can be used for colon polyps of 0.4cm, and it is suitable for the resection of both clipped polyps and non-clipped polyps with a diameter of <2cm. 3. Cold loop polypectomy: colon polyp 0.4cm can be used cold loop polypectomy, it can be abnormal hyperplasia tissue forceps shear removal, the wound can be narrowed the next day, the postoperative patients faster recovery. Colon polyp 0.4cm specific how to excise, should be combined with the location of the colon polyp by the doctor, the patient's opinion comprehensive consideration, it is recommended that colon polyp 0.4cm patients to go to the regular hospital in a timely manner. The resection of the colon polyp tissue should be routinely pathologically examined.