The new painless gastroscopy technology laughing gas inhalation analgesia electronic gastroscopy is a new painless gastroscopy recently carried out in our hospital, reducing the discomfort of bloating, pain, violent vomiting and other discomforts produced during the traditional gastroscopy consultation and treatment, transforming the patient’s fear, nervousness and bewilderment about the examination into a relaxed and trusting cooperation. The technique has the following characteristics: 1. Painless. The effect of laughing gas is rapid, 30~50 seconds to produce analgesic effect, stop inhalation 2~4 minutes most of them can be expelled through the lungs, resuscitation is fast and complete, the patient can be fully awake and independent activities after the operation. Many tertiary hospitals in China have carried out this technique, and the application shows that the analgesic effect of this technique is ideal, comfortable and effective. 2.Safety. Laughing oxygen mixture has been applied abroad for 160 years and has been proved to be a safe and effective method to control pain and anxiety. Short-term use of laughing gas does not stimulate the respiratory system and has no adverse effects on the heart, lungs, liver, kidney and nervous system. And can be used for elderly patients. 3, easy to operate. Patients inhaling laughing oxygen mixture can produce sedation and analgesia, while remaining awake, still have vomiting and coughing reflexes, and can communicate with the doctor and cooperate with the doctor to change positions, reducing the risk of misaspiration, infection, respiratory depression, etc. 4.Low price. Compared with intravenous anesthesia, laughing gas is inexpensive, and according to the regulations of the Ministry of Health, the concentration of laughing gas applied to endoscopy is between 30% and 60%, so it is not necessary to have a full-time anesthesiologist, which saves resources, and in general, gastroscopy can be done in 5 minutes by inhaling laughing gas.