The steps of gastroscopy include the following: the first point, the preparation before gastroscopy. The patient should be in a fasting state, and should not eat or drink. In addition, the patient should have no relevant contraindications, such as high blood pressure, serious cardiovascular and cerebrovascular diseases and so on. The second point is that the anesthetic is swallowed before gastroscopy. Swallowing anesthetic is to make the esophagus more adaptable to this operation and also to reduce the discomfort. The third point, the examination work. Generally, the gastroscope from the mouth, has been through the esophagus, cardia, stomach, all the way to the duodenum, to take pictures to make a report. The fourth point, the final exit mirror is completed, the patient normally fasts for two hours before the patient can routinely eat some fluids, and then closer to a normal diet, if there is a related operation, but also to extend the time.