emr refers to endoscopic mucosal resection, endoscopic mucosal resection of the choice of submucosal injection depending on different circumstances, different parts of the injection of different drugs, you need to choose the appropriate injection under the diagnosis of the doctor. Most of the endoscopic submucosal resections are performed by mixing saline, epinephrine and indigo carmine in a certain ratio and then injecting. For the esophagus, colon, digestive tract and other parts of the surgery is generally used for glycerol fructose, epinephrine and indocyanine mixed in a certain ratio of injection; for the fat and blood vessel-rich parts of the use of hyaluronic acid, epinephrine and indocyanine mixed in a certain ratio of injection and so on. The choice of submucosal injection solution for endoscopic mucosal resection depends on the actual situation of the patient, and the optimal solution can be selected only after standardized treatment and relevant examinations under the guidance of the doctor.