The small intestine is more than 6 meters long, accounting for 3/4 of the total length of the digestive tract, and is in full contact with food to complete the digestion and absorption of nutrients (sugars, proteins, fats, vitamins and inorganic salts, etc.), and is the “supply line” for life activities. The human small intestine is long, wide and numerous, and it can be aptly compared to a “labyrinth”. Small intestine diseases (bleeding, ulcers, tumors, etc.) are often compared to “forgotten corners” and are easily ignored or even misdiagnosed by doctors and patients. Ordinary gastroscopy is difficult to examine the small intestine in depth, while the newly developed capsule endoscopy in recent years, the shape of a capsule, containing a camera chip, can take 2-4 pictures per second. After swallowing this special “capsule”, it moves from the stomach to the rectum through the mouth and can give a “panoramic view” of the “labyrinth” without any side effects. Advantages of capsule endoscopy: 1, extended field of view, easy to operate, color images of the whole small intestine, clear microscopic, improve the diagnosis of small intestinal disease detection rate. 2, the capsule is single-use, effectively avoid cross-infection; non-toxic to humans, non-stimulating, strong structure, will not break or dissolve, can be safely eliminated from the body. 3, only need to swallow a capsule, the examination process is non-invasive and painless, no wires, no anesthesia, no delay in normal work and life.