The electronic gastroscope is an electronic optical instrument that can reach into the stomach cavity and diagnose and treat lesions in the gastrointestinal tract. It is mainly composed of an objective system, an image array surface photoelectric sensor, and an A/D conversion integrated module. The electronic gastroscope can present the tiny lesions in the stomach and digestive tract on the display screen to facilitate the doctor to make an accurate diagnosis. The electronic gastroscopy can see very clear images and can also be followed up by the computer. Electronic gastroscopy is the most accurate method for diagnosing esophageal, gastric and duodenal diseases, and is considered the gold standard for the diagnosis of gastrointestinal diseases. It is also simple, flexible and easy to operate. Thanks to the application of electronic technology, various operations can be performed under the direct view of the monitor in both diagnosis and treatment of diseases, which is simple and convenient. Patient discomfort is reduced to a minimum due to the fine diameter of the endoscope body, which minimizes patient discomfort when the body is inserted into the body cavity. Since the image is observed on the monitor, the patient himself can also directly participate in the observation, which plays a positive role in eliminating the patient’s nervousness and increasing the patient’s interest and confidence in the examination, so the electronic gastroscope is a very advanced examination instrument.