Capsule endoscopy is called "intelligent capsule endoscopy system", also known as "medical wireless endoscopy". The principle is that the subject takes a smart capsule with a built-in camera and signal transmission device orally, and uses the peristalsis of the digestive tract to move it in the digestive tract and capture images. The doctor uses an external image recorder and imaging workstation to understand the subject's entire digestive tract. situation to diagnose their condition. Capsule endoscopy has the advantages of convenient inspection, non-invasive, no wires, no pain, no cross-infection, and does not affect the patient's normal work. It expands the field of view of the gastrointestinal tract examination and overcomes the tolerance of traditional insertion endoscopes. It has shortcomings such as poor sex and not suitable for the elderly, frail and critically ill. It can be used as the first choice method for diagnosing digestive tract diseases, especially small intestinal diseases.