The examination process of gastroscopy includes preparation before the examination, preparation during the examination and precautions after the examination. 1. Pre-examination preparation: ensure fasting status for 6-8 hours before the examination; before the examination, electrocardiogram, blood routine and other tests should be carried out to exclude diseases that are not suitable for gastroscopy. 2. Preparation for the examination: relax your mind during the examination and actively cooperate with the doctor to take the appropriate position. If you are too nervous, you may not be able to complete the gastroscopy; if the painless gastroscopy will be injected with anesthesia in advance, there is no need to cooperate with the doctor. 3. Post-examination precautions: After the examination, the doctor can guide whether and when to fast, whether to eat or specific food according to the specific situation. For the examination process of gastroscopy, it is recommended to be instructed by the doctor after the consultation.