Ultrasound endoscopy is an examination method that combines endoscopic technology with ultrasound technology, which can not only directly observe the gastric mucosa, but also obtain the histological characteristics of the gastric wall at all levels and the lesions of the liver, gallbladder, pancreas, colon and other neighboring tissues or organs. Ultrasound endoscopy is the installation of ultrasound probe endoscope inserted into the stomach or intestinal cavity, not only through the endoscope can directly observe the gastrointestinal mucosa surface lesions, but also through the ultrasound to obtain the histological characteristics of the gastrointestinal tract at all levels, and the ultrasound images of neighboring organs or organs. Ultrasound endoscopy can be used to determine the origin and nature of submucosal tumors in the gastrointestinal tract, to judge the depth of invasion of digestive tumors, to diagnose hepatobiliary and pancreatic system tumors or inflammatory lesions, colon and mediastinal lesions, etc. If necessary, biopsies can also be taken from the suspicious parts of the body for pathology examination. In addition, ultrasonic endoscopy can also perform gastrointestinal hemostasis, resection of diseased tissue and other treatments. Ultrasonic endoscopy should be carried out reasonably under the guidance of the doctor, and during the examination, the doctor’s instructions should be strictly followed, the gastrointestinal tract should be well prepared, and cooperate with the doctor to carry out the examination.