Peptic ulcer is one of the common upper gastrointestinal diseases, including gastric ulcer, duodenal bulb ulcer, compound ulcer, etc. In this case, since the ulcer site is often deep, sometimes reaching the base layer, even the serous layer of the gastric mucosa. If gastric lavage is performed too vigorously, gastric perforation may occur. Therefore, generally, gastric lavage is not advocated, but in a few cases, such as organophosphate pesticide poisoning or other drug poisonings, etc. If gastric lavage is not performed promptly, it often leads to serious complications, even life-threatening. Therefore, gastric lavage is still needed in a few cases, and in these situations, the procedure must be gentle and not too prolonged.