Growth inhibitor is a drug that can be obtained from the hypothalamus and has the amino acid, 14 peptide that inhibits the release of growth hormone. Growth inhibitor for the treatment of upper gastrointestinal bleeding mechanism of action is: 1, growth inhibitor can significantly reduce the blood flow of the viscera, reduce the pressure of the portal vein, can also reduce the blood flow and pressure of the collateral circulation, will be less blood flow to the liver, can effectively play a role in hemostasis; 2, can inhibit gastrin to stimulate the secretion of residual gastric acid, can inhibit the release function of pepsin, gastrin, so as to play a role in protecting the gastric mucosa; 3, can inhibit gastrin to stimulate the secretion of residual gastric acid, can inhibit the release function of pepsin, gastrin. 3, reduce the internal and external secretion of the pancreas and the secretion of the stomach and intestines, reduce enzyme activity, and play a protective role for pancreatic cells; 4, can inhibit the secretion of growth hormone, thyroid stimulating hormone, insulin and glucagon; 5, can be unaccompanied by systemic hemodynamic changes, and there are no serious adverse reactions to the short-term use of the drug; 6, affect the absorption and nutritional function of the gastrointestinal tract.