The small intestine is an important digestive organ of the human body, and due to its specific anatomical location, small intestine diseases have always been the bottleneck in the diagnosis and treatment of digestive system diseases, and it is difficult to make a clear diagnosis due to the low sensitivity and accuracy of various traditional examination methods. With the continuous development of gastrointestinal endoscopy technology, especially the introduction of small intestine microscopy, a whole new field of small intestine disease examination has been opened up. Single-balloon small intestine microscopy brings good news to patients suspected of small intestine diseases, especially some patients with long-term abdominal pain, diarrhea and gastrointestinal bleeding, whose causes cannot be found by colonoscopy, gastroscopy and barium meal of gastrointestinal tract. Single-balloon electronic small intestine microscope is one of the latest technologies used in the diagnosis and treatment of small intestine diseases. It fixes the small intestine tube through a single balloon and inserts the endoscope and the jacket tube alternately, thus completing the examination of the whole small intestine. Target: people with unexplained gastrointestinal bleeding; people with chronic abdominal pain, chronic diarrhea, suspected organic lesions of the small intestine; patients with Crohn’s disease; people with abnormal small intestinal imaging, such as lymphoma and other tumors; occasions when treatment of small intestinal diseases is needed: polyp removal, small intestine hemostasis, small intestine dilation, foreign body removal. Advantages of single balloon small intestine microscopy: good diagnostic performance; clear picture quality; under the painless examination technology, the whole small intestine can be examined smoothly without pain and discomfort during the examination, with good patient tolerance and safety. In addition to clarifying the cause, it can also take pathological biopsy for small intestine diseases, perform microscopic hemostasis treatment for hemorrhagic lesions, and perform stent placement and polyps removal treatment under the microscope because it is treated under direct vision with high accuracy.