The preparation for gastroscopy includes perfecting the relevant examinations such as blood routine, fasting, water fasting, and adjusting the mood. 1. Improvement of relevant examinations: Improvement of relevant examinations should be carried out according to the doctor’s instructions, such as preoperative eight items, blood routine, coagulation function, electrocardiogram, and imaging examination, etc. The purpose of these examinations is to determine the contraindications to gastroscopy. The purpose of these examinations is to determine whether the patient has any contraindications to gastroscopy. 2. Fasting and water prohibition: Gastroscopy needs to be examined in the fasting state of the human body. It is recommended that patients should pay attention to a low residue diet the day before the examination, avoid eating and drinking after 10:00 p.m. on the night before the examination, and avoid drinking water within three hours before the examination. To ensure that the stomach is in a state of emptiness during the examination. 3. Adjustment of emotions: Gastroscopy is an invasive examination, during the examination process, patients may experience nausea, dry heaving and other stressful reactions. It is recommended to maintain emotional stability to avoid excessive tension affecting the progress of the examination. At the same time, ensure enough sleep before the examination. It is recommended that patients actively go to the gastroenterology department of regular hospitals for gastroscopy, and consult your doctor for specific preparations.