EMR surgery is an abbreviation for endoscopic mucosal resection, which is a kind of minimally invasive endoscopic surgery developed by Japanese experts in the 1980s, mainly used for the treatment of early cancer, first applied to early gastric cancer, or can be applied to early esophageal cancer, early colon cancer, and the results are very good. EMR surgery is mainly applicable to early cancer surgery, but it can also be extended for partial resection of precancerous lesions and polyps, and also for cases where cancer is confined to the mucosa, without metastasis and within 2 cm in size, cases where the whole block can be resected, early esophageal lesions of the above manifestations, and early stage This method is also used for partial benign polyps in the colon, which has the advantage of high safety and complete resection, because the drug is administered under the mucosa first, and then the whole lesion is removed, which obviously increases the safety of polypectomy.